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 A278259 #8 Nov 22 2016 21:50:36 %S A278259 0,1,2,4,6,4,12,16,12,4,30,36,30,4,24,64,72,16,60,36,30,4,60,144,60,4, %T A278259 30,36,210,36,240,256,48,4,60,144,60,4,60,144,420,36,210,36,30,4,120, %U A278259 576,360,16,60,36,120,64,360,144,60,4,210,900,210,4,96,1024,480,36,210,36,210,36,1260,1296,180,4,30,36,210,36,840,576,120,4,210,900,210,4,60 %N A278259 Least number with the prime signature of the n-th quarter-square, a(1) = 0. %H A278259 Antti Karttunen, <a href="/A278259/b278259.txt">Table of n, a(n) for n = 1..10000</a> %F A278259 a(1) = 0; for n > 1, a(n) = A046523(A002620(n)). %o A278259 (Scheme) (define (A278259 n) (if (<= n 1) 0 (A046523 (A002620 n)))) %Y A278259 Cf. A002620, A046523. %Y A278259 Cf. A278254, A278256 (bisections). %Y A278259 Cf. also A278260. %K A278259 nonn %O A278259 1,3 %A A278259 _Antti Karttunen_, Nov 22 2016