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 A275007 #36 Dec 11 2016 23:43:05 %S A275007 1,12,286,5978,111136,283584,339379,1102652,8830498,27952828,30442612, %T A275007 84638560,90619592,101907952,175917947 %N A275007 Numbers n such that 2^n == sigma(n) (mod n). %C A275007 Numbers n such that A015910(n) = A054024(n). - _Michel Marcus_, Dec 11 2016 %e A275007 12 is a term because 2^12 == sigma(12) (mod 12). %o A275007 (PARI) is(n)=Mod(2, n)^n==sigma(n); %Y A275007 Cf. A000079, A000203, A015910, A054024. %K A275007 nonn,more %O A275007 1,2 %A A275007 _Altug Alkan_, Dec 11 2016