This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A112759 #7 Feb 07 2020 09:04:13 %S A112759 0,1,1,2,1,2,3,2,2,3,2,4,3,3,4,2,3,3,5,4,4,3,5,3,4,4,6,5,3,5,4,4,6,4, %T A112759 5,5,3,7,4,6,4,6,5,5,7,5,6,4,6,5,4,8,5,7,5,7,6,6,4,8,6,5,7,5,7,6,5,9, %U A112759 6,8,6,4,8,7,5,7,6,5,9,7,6,8,6,8,7,6,10,7,5,9,7,6,5,9,8,6,8,7,6,10,8,7,9,7 %N A112759 Total number of prime factors of n-th 5-smooth number. %H A112759 Amiram Eldar, <a href="/A112759/b112759.txt">Table of n, a(n) for n = 1..10000</a> %F A112759 a(n) = A001222(A051037(n)); %F A112759 a(n) = A112760(n) + A112761(n) + A112762(n). %t A112759 PrimeOmega @ Select[Range[3000], Last @ Map[First, FactorInteger[#]] <= 5 &] (* _Amiram Eldar_, Feb 07 2020 *) %Y A112759 Cf. A001222, A051037, A069352, A112754, A112758, A112760, A112761, A112762. %K A112759 nonn %O A112759 1,4 %A A112759 _Reinhard Zumkeller_, Sep 18 2005