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 A278260 #8 Nov 22 2016 21:50:42
%S A278260 1,2,2,2,2,6,2,2,6,6,2,2,2,12,6,6,2,6,6,2,6,6,6,6,2,30,6,2,2,6,2,2,30,
%T A278260 30,2,12,8,6,6,2,2,30,2,6,12,30,6,2,2,6,30,2,6,30,2,6,6,6,6,6,12,30,6,
%U A278260 12,6,30,2,6,6,6,6,2,6,30,30,12,2,6,6,2,6,12,2,6,6,60,6,6,6,6,6,6,30,210,6,6,6,6,30,6,2,6,6,6,6,30,6,2,2,30,30,2,6
%N A278260 Least number with the same prime signature as {the n-th quarter-square}+1.
%C A278260 Great majority of the terms seem to be primorials (A002110), 9149 of the first 10000, meaning also that the corresponding terms in A033638 are squarefree (A005117).
%H A278260 Antti Karttunen, <a href="/A278260/b278260.txt">Table of n, a(n) for n = 1..10000</a>
%F A278260 a(n) = A046523(A033638(n)).
%o A278260 (Scheme) (define (A278260 n) (A046523 (A033638 n)))
%Y A278260 Cf. A002110, A005117, A033638, A046523.
%Y A278260 Cf. A278162 (bisection).
%Y A278260 Cf. also A278254, A278259.
%K A278260 nonn
%O A278260 1,2
%A A278260 _Antti Karttunen_, Nov 22 2016