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 A355436 #8 Jul 04 2022 13:57:06 %S A355436 1,2,4,3,8,5,16,6,13,7,32,12,64,15,9,11,128,20,256,10,17,31,512,14,25, %T A355436 63,29,18,1024,24,2048,22,33,127,49,21,4096,255,61,23,8192,28,16384, %U A355436 30,52,511,32768,19,113,26,125,62,65536,36,57,27,253,1023,131072 %N A355436 Inverse permutation to A355435. %H A355436 Rémy Sigrist, <a href="/A355436/b355436.txt">Table of n, a(n) for n = 1..10000</a> %H A355436 Rémy Sigrist, <a href="/A355436/a355436.gp.txt">PARI program</a> %F A355436 a(prime(n)) = 2^n for any n > 0 (where prime(n) denotes the n-th prime number). %e A355436 A355435(28) = 42, so a(42) = 28. %o A355436 (PARI) See Links section. %Y A355436 Cf. A355435. %K A355436 nonn %O A355436 1,2 %A A355436 _Rémy Sigrist_, Jul 02 2022