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Consecutive integers with equal bigomega(n) - omega(n)
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4d085c9032
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3 years ago |
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Consecutive integers with equal sigma0(n) - omega(n)
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4d085c9032
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3 years ago |
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Index of the smallest Fibonacci n-step number with exactly n distinct prime factors
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00d3898010
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1 year ago |
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Index of the smallest Fibonacci n-step number with exactly n prime factors (counted with multiplicity)
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00d3898010
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1 year ago |
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Index of the smallest n-gonal number divisible by exactly n n-gonal numbers
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b0a884dc5a
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1 year ago |
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Index of the smallest n-gonal pyramidal number divisible by exactly n n-gonal pyramidal numbers
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b0a884dc5a
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1 year ago |
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Index of the smallest square pyramidal number with exactly n prime factors (counted with multiplicity)
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d96b916160
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1 year ago |
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Index of the smallest tetrahedral number with exactly n distinct prime factors
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5427f05b84
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1 year ago |
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Index of the smallest tetrahedral number with exactly n prime factors (counted with multiplicity), or -1 if no such number exists
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b0a884dc5a
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1 year ago |
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Index of the smallest tetranacci number (A000078) with exactly n distinct prime factors
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00d3898010
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1 year ago |
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Index of the smallest tetranacci number (A000078) with exactly n prime factors (counted with multiplicity)
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00d3898010
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1 year ago |
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Index of the smallest tribonacci number (A000073) with exactly n distinct prime factors
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00d3898010
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1 year ago |
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Index of the smallest tribonacci number (A000073) with exactly n prime factors (counted with multiplicity)
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00d3898010
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1 year ago |
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Least number k such that the average number of prime divisors of {1..k} counted with multiplicity is >= n
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7935360128
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1 year ago |
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Maximal coefficient of (1 + x^a(1)) * (1 + x^a(1) + x^a(2)) * ... * (1 + x^a(1) + x^a(2) + ... + x^a(n-1))
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416c61a8d4
new file: oeis-research/Ilya Gutkovskiy/Maximal coefficient of (1 + x^a(1)) * (1 + x^a(1) + x^a(2)) * ... * (1 + x^a(1) + x^a(2) + ... + x^a(n-1))/prog.sf
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3 months ago |
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N-th prime recursive sum
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085080796b
new file: oeis-research/Ilya Gutkovskiy/N-th prime recursive sum/prog.sf
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3 years ago |
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Number of subsets of {1..n} whose harmonic mean is an integer
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d7a70e0ab2
modified: oeis-research/Amiram Eldar/a(n) is the least number k such that the n-th odd squarefree divides lcm(1..k) over denom(harmonic(k))/prog.sf
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3 years ago |
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Numbers k such that the average number of odd divisors of {1..k} is an integer
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30f8a3a5eb
new file: oeis-research/Ilya Gutkovskiy/Numbers k such that the average number of odd divisors of {1..k} is an integer/binary_search.sf
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3 years ago |
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Perfect powers that are equal to the sum of the first k perfect powers > 1 for some k
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61449f48a1
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8 months ago |
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Smallest centered n-gonal number divisible by exactly n centered n-gonal numbers
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7bbb8b9505
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1 year ago |
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Smallest centered n-gonal number with exactly n distinct prime factors
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7bbb8b9505
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1 year ago |
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Smallest centered n-gonal number with exactly n prime factors (counted with multiplicity)
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9303a08f23
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1 year ago |
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Smallest centered square number divisible by exactly n centered square numbers
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b0a884dc5a
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1 year ago |
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Smallest centered square number with exactly n distinct prime factors
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d96b916160
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1 year ago |
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Smallest centered square number with exactly n prime factors (counted with multiplicity)
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d96b916160
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1 year ago |
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Smallest centered triangular number with exactly n distinct prime factors
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4a6a2d408c
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1 year ago |
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Smallest centered triangular number with exactly n prime factors (counted with multiplicity)
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9303a08f23
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1 year ago |
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Smallest n-gonal number divisible by exactly n n-gonal numbers
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d0321699d3
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1 year ago |
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Smallest n-gonal number with exactly n distinct prime factors
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43bfcd0d07
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1 year ago |
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Smallest n-gonal number with exactly n prime factors (counted with multiplicity)
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9303a08f23
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1 year ago |
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Smallest n-gonal pyramidal number divisible by exactly n n-gonal pyramidal numbers
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b0a884dc5a
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1 year ago |
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Smallest n-gonal pyramidal number which can be represented as the sum of n distinct nonzero n-gonal pyramidal numbers in exactly n ways, or -1 if none exists
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1af2ab854d
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1 year ago |
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Smallest n-gonal pyramidal number with exactly n distinct prime factors
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7762fb86b8
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1 year ago |
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Smallest n-gonal pyramidal number with exactly n prime factors (counted with multiplicity)
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9303a08f23
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1 year ago |
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Smallest number k such that n consecutive integers starting at k have the same number of triangular divisors
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fc7488854e
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1 year ago |
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Smallest number that is the sum of two distinct n-th powers of primes in two different ways
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085080796b
new file: oeis-research/Ilya Gutkovskiy/N-th prime recursive sum/prog.sf
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3 years ago |
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Smallest number which can be represented as the product of n distinct integers > 1 in exactly n ways
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fc775e378b
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1 year ago |
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Smallest number with exactly n divisors that are n-gonal numbers
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d0321699d3
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1 year ago |
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Smallest positive integer which can be represented as the sum of distinct positive Fibonacci n-step numbers (with a single type of 1) in exactly n ways, or -1 if no such integer exists
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4e90aa9a0b
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1 year ago |
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Smallest square pyramidal number with exactly n distinct prime factors
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d96b916160
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1 year ago |
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Squarefree harmonic sum exceeds n
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4d085c9032
Remove commit history
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3 years ago |
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a(n) is the index of the smallest square pyramidal number divisible by exactly n square pyramidal numbers
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4a6a2d408c
Update.
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1 year ago |
