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 A104412 #24 May 16 2021 03:08:33
%S A104412 0,0,1,2,3,4,1,1,5,3,5,6,2,4,6,5,9,6,2,2,6,4,6,7,1,3,3,6,4,7,4,2,7,3,
%T A104412 9,7,3,2,2,8,9,8,2,4,11,7,9,7,7,2,4,5,6,7,3,2,7,7,13,8,4,5,5,6,10,5,4,
%U A104412 7,11,7,8,9,4,5,4,8,7,8,4,5,6,5,10,12,2,4,5,9,12,11,7,4,13
%N A104412 Number of prime factors, with multiplicity, of the pentanacci numbers A001591.
%C A104412 Prime pentanacci numbers (A105757) correspond to 1s in the sequence, semiprimes to 2, and so forth.
%H A104412 Amiram Eldar, <a href="/A104412/b104412.txt">Table of n, a(n) for n = 4..237</a>
%H A104412 (terms 4..124 from Charles R Greathouse IV) [offset adapted by _Georg Fischer_, Jan 04 2021]
%F A104412 a(n) = A001222(A001591(n)). a(n) = bigomega(A001591(n)).
%t A104412 PrimeOmega/@Drop[LinearRecurrence[{1,1,1,1,1},{0,0,0,0,1},100],4] (* _Harvey P. Dale_, Mar 30 2019 *)
%Y A104412 Cf. A001591, A001222, A104411.
%K A104412 nonn
%O A104412 4,4
%A A104412 _Jonathan Vos Post_, Mar 05 2005
%E A104412 Offset corrected by _Joerg Arndt_, Dec 19 2020