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6^n is the sum of two consecutive primes
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4d085c9032
Remove commit history
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3 years ago |
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Concatenation of numbers from n to a(n) is prime
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4d085c9032
Remove commit history
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3 years ago |
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First n-almost prime after 3^n
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5427f05b84
Update.
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1 year ago |
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First number k such that Omega(k) = n and Omega(n - 1) = Omega(n + 1) = n + 1
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7cf88d901b
new file: oeis-research/Zak Seidov/First number k such that Omega(k) = n and Omega(n - 1) = Omega(n + 1) = n + 1/generate.pl
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4 months ago |
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First prime p such that, if q are r are the next two primes, p + r, p + q, q + r and p + q + r all have n prime divisors, counted with multiplicity
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4220419d49
new file: oeis-research/Zak Seidov/First prime p such that, if q are r are the next two primes, p + r, p + q, q + r and p + q + r all have n prime divisors, counted with multiplicity/almost_prime_generation.pl
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5 months ago |
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Least k that starts a sequence of exactly n numbers on which i + Omega(i) is constant
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7cf88d901b
new file: oeis-research/Zak Seidov/First number k such that Omega(k) = n and Omega(n - 1) = Omega(n + 1) = n + 1/generate.pl
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4 months ago |
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Least number k such that 3^k-2 and 3^k+2 are the product of n prime factors counted with multiplicity
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9303a08f23
Update.
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1 year ago |
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Least odd number k such that Omega(k) = n, Omega(k+2) = n+1, and Omega(k+4) = n+2
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7f20b33810
new file: oeis-research/Zak Seidov/Least odd number k such that Omega(k) = n, Omega(k+2) = n+1, and Omega(k+4) = n+2/prog.pl
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3 years ago |
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Least prime p such that the concatenation p|n has exactly n prime factors with multiplicity
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147f6207b2
Update.
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1 year ago |
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Numbers k that are the sum and product of 5 consecutive primes
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4d085c9032
Remove commit history
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3 years ago |
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Prev prime and next prime same nr of factors
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4d085c9032
Remove commit history
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3 years ago |
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Primes p congruent to 1..10 mod 11
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10f6e6bba5
modified: oeis-research/Zak Seidov/Primes p congruent to 1..10 mod 11/check.sf
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3 years ago |
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Primes p congruent to 1..8 mod 13
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0aff21f2d9
new file: oeis-research/Bernard Schott/Smallest number m such that tau(k) * k = m has n solutions/smooth_generate.pl
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3 years ago |
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Smallest prime p cogruent to 1..prime(n)-1 mod prime(n)
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fc7edadda6
new file: oeis-research/Zak Seidov/Primes p congruent to 1..8 mod 13/check.sf
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3 years ago |
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a(n) = sigma_2(a(n-1)), with a(1) = 2
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4d085c9032
Remove commit history
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3 years ago |
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a(n) is the least odd number k such that Omega(k) = n, Omega(k+2) = n+1, and Omega(k+4) = n+2
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e6e24cbcd4
Update.
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9 months ago |
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a(n) is the smallest even number k such that k-1 and k+1 are both n-almost primes
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2b693fc78d
new file: oeis-research/Benoit Cloitre/Where 11^n occurs in n-almost-primes, starting at a(0)=1/prog.sf
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11 months ago |
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a(n) is the smallest number m such that m, m+1, m+2 and m+3 each have exactly n prime factors (counted with multiplicity)
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375c48c0ee
Update.
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1 year ago |
