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 A035261 #7 Jul 30 2020 12:19:12 %S A035261 1,2,4,7,8,9,11,13,14,16,18,19,22,23,25,26,28,29,32,36,38,41,43,44,46, %T A035261 49,50,52,56,58,63,64,67,72,73,76,77,79,81,82,83,86,88,91,92,98,99, %U A035261 100,101,103,104,107,112,116,117,121,126,128,133,134,143,144,146 %N A035261 Indices of the nonzero terms in expansion of Dirichlet series Product_p (1-(Kronecker(m,p)+1)*p^(-s)+Kronecker(m,p)*p^(-2s))^(-1) for m= 23. %o A035261 (PARI) m=23; select(x -> x, direuler(p=2,101,1/(1-(kronecker(m,p)*(X-X^2))-X)), 1) %Y A035261 Cf. A035205 (the expansion itself). %K A035261 nonn %O A035261 1,2 %A A035261 _N. J. A. Sloane_ %E A035261 Edited and extended by _Andrey Zabolotskiy_, Jul 30 2020