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 A364287 #6 Jul 25 2023 12:30:53 %S A364287 7,14,15,28,29,30,31,56,58,59,60,61,62,63,112,116,118,119,120,121,122, %T A364287 123,124,125,126,127,223,224,232,236,238,239,240,242,244,245,246,247, %U A364287 248,249,250,251,252,253,254,255,383,446,447,448,464,472,476,478,479,480,484,488,490,492,493,494,495,496,497,498 %N A364287 Numbers k such that A163511(k) < k. %C A364287 If k is present, then 2*k is also present, and vice versa. %o A364287 (PARI) isA364287(n) = (A163511(n)<n); %Y A364287 Positions of negative terms in A364258. %Y A364287 Cf. A163511. %Y A364287 Cf. also A364289, A364290. %K A364287 nonn %O A364287 1,1 %A A364287 _Antti Karttunen_, Jul 25 2023