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 A355895 #14 Aug 29 2022 05:31:10 %S A355895 1,3,11,7,17,41,37,83,79,109,241,239,499,491,1117,1109,2539,2531,5623, %T A355895 5591,11471,11467,23369,23357 %N A355895 Even terms in A354790, divided by 2, in order of appearance. %C A355895 The even terms in A354790 appear at indices 2, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, ... and conjecturally at indices 2^k-1 for all k >= 3. %Y A355895 Cf. A354790, A355896. %K A355895 nonn,more %O A355895 1,2 %A A355895 _N. J. A. Sloane_, Aug 27 2022 %E A355895 a(16)-a(24) from _Rémy Sigrist_, Aug 29 2022