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- #!/usr/bin/ruby
- # a(1) = a(2) = 1, a(n) is largest prime factor of concatenation of a(n - 2) and a(n - 1)
- # https://oeis.org/A034969
- include('../../../factordb/auto.sf')
- func a(n) is cached {
- return 1 if (n == 1)
- return 1 if (n == 2)
- gpf(Num(join('', a(n-2), a(n-1))))
- }
- var fh = File('bfile.txt').open_w
- fh.autoflush(true)
- for n in (1..10000) {
- var row = "#{n} #{a(n)}"
- say row
- fh.say(row)
- }
- __END__
- not FF: 7126739067843933020000487256784061533502292405050614853348381662921208997064469253693331951904248670646197372897799059990001235916032762454201142581635442146548653091082552430069916765671381205795126681208177737489544209036771593
|
