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 A035240 #11 Sep 03 2020 19:23:15 %S A035240 1,2,3,4,6,8,9,12,13,16,18,23,24,25,26,27,29,31,32,36,39,41,46,47,48, %T A035240 49,50,52,54,58,59,62,64,69,71,72,73,75,78,81,82,87,92,93,94,96,98, %U A035240 100,101,104,108,116,117,118,121,123,124,127,128,131,138,139,141 %N A035240 Indices of 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 (A035167). %o A035240 (PARI) m=-23; select(x -> x, direuler(p=2, 301, 1/(1-(kronecker(m, p)*(X-X^2))-X)), 1) \\ Fixed by _Andrey Zabolotskiy_, Sep 03 2020 %Y A035240 Cf. A035167. %K A035240 nonn %O A035240 1,2 %A A035240 _N. J. A. Sloane_ %E A035240 Definition corrected by _Georg Fischer_, Sep 03 2020 %E A035240 a(50) and beyond from _Andrey Zabolotskiy_, Sep 03 2020