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 A296212 #10 Dec 25 2018 11:36:46 %S A296212 1,0,1,0,1,1,0,0,0,1,1,1,0,0,0,0,1,0,0,1,0,1,0,1,0,1,1,0,1,1,0,0,0,0, %T A296212 0,0,0,1,0,0,1,1,0,0,1,1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,1,0,0,0,0,0,1, %U A296212 1,0,1,0,0,0,0,0,1,0,0,0,0,1,0,0,1,0,0,1,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,1,1,1,1,1,0,0,0,0,0,1,0,1,0,1,0,0 %N A296212 a(n) = 1 if sigma(n) + 1 is prime, 0 otherwise. %C A296212 Characteristic function of A065512, numbers n such that sigma(n) + 1 is prime. %H A296212 Antti Karttunen, <a href="/A296212/b296212.txt">Table of n, a(n) for n = 1..65537</a> %H A296212 <a href="/index/Ch#char_fns">Index entries for characteristic functions</a> %F A296212 a(n) = A010051(1+A000203(n)) = A010051(A088580(n)). %o A296212 (Scheme) (define (A296212 n) (A010051 (+ 1 (A000203 n)))) %Y A296212 Cf. A000203, A010051, A065512, A088580, A296092. %Y A296212 Cf. also A296077, A296079, A296211. %K A296212 nonn %O A296212 1,1 %A A296212 _Antti Karttunen_, Dec 07 2017