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 A278255 #5 Nov 22 2016 21:50:15 %S A278255 1,2,12,6,6,6,30,12,12,6,48,210,6,6,210,24,12,12,60,30,30,30,30,60,12, %T A278255 30,1080,30,6,30,30,240,60,6,420,60,30,6,210,420,6,120,192,30,60,6, %U A278255 210,840,12,12,420,210,6,120,210,60,210,6,120,210,30,30,420,96,30,30,180,210,30,210,30,1260,6,30,5040,30,210,30,30,120,144,60,60,210,30,6,2310 %N A278255 Least number with the prime signature of the n-th pentagonal number. %H A278255 Antti Karttunen, <a href="/A278255/b278255.txt">Table of n, a(n) for n = 1..10000</a> %F A278255 a(n) = A046523(A000326(n)). %o A278255 (Scheme) (define (A278255 n) (A046523 (A000326 n))) %Y A278255 Cf. A000326, A046523. %Y A278255 Cf. also A278246, A278247, A278251, A278253, A278254. %K A278255 nonn %O A278255 1,2 %A A278255 _Antti Karttunen_, Nov 21 2016