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 A025556 #19 Sep 29 2024 08:56:33
%S A025556 0,1,2,3,3,4,5,6,6,7,7,8,8,8,9,10,10,11,11,11,11,12,12,13,13,14,14,15,
%T A025556 15,16,17,17,17,17,17,18,18,18,18,19,19,20,20,20,20,21,21,22,22,22,22,
%U A025556 23,23,23,23,23,23,24,24,25,25,25,26,26,26,27,27,27,27,28,28,29,29,29,29,29,29,30
%N A025556 a(n) = sum of the exponents in the prime factorization of LCM{1,3,6,...,C(n+1,2)}.
%H A025556 <a href="/index/Lc#lcm">Index entries for sequences related to lcm's</a>
%F A025556 a(n) = A001222(A025555(n)). - _Sean A. Irvine_, Sep 06 2019
%F A025556 a(n) = A025528(n+1)-1. - _Pontus von Brömssen_, Sep 28 2024
%o A025556 (PARI) a025555(n) = my(s=1); for(k=1, n, s=lcm(s, k*(k+1)/2)); s \\ after _Edward Jiang_ in A025555
%o A025556 a(n) = bigomega(a025555(n)) \\ _Felix Fröhlich_, Sep 06 2019
%Y A025556 Cf. A001222, A025528, A025555.
%K A025556 nonn
%O A025556 1,3
%A A025556 _Clark Kimberling_
%E A025556 More terms from _Sean A. Irvine_, Sep 06 2019