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 A382360 #6 Mar 26 2025 16:16:57 %S A382360 1,2,5,6,27,28,87,88,371,372,1303,1304,5717,5718,27099,27100,100637, %T A382360 100638,429041,429042,1676037,1676038,6566201,6566202,26703687, %U A382360 26703688,105939329,105939330,424972311,424972312,1688465121,1688465122,6744826613,6744826614 %N A382360 a(n) is the unique k such that A382357(k) = 2^n. %H A382360 Rémy Sigrist, <a href="/A382360/a382360.gp.txt">PARI program</a> %H A382360 Rémy Sigrist, <a href="/A382360/a382360.txt">C++ program</a> %F A382360 Empirically: a(2*n+1) = a(2*n)+1. %e A382360 A382357(27) = 2^4, so a(4) = 27. %o A382360 (PARI) \\ See Links section. %o A382360 (C++) // See Links section. %Y A382360 Cf. A382357. %K A382360 nonn,base %O A382360 0,2 %A A382360 _Rémy Sigrist_, Mar 22 2025