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 A031155 #12 Apr 12 2020 03:47:36 %S A031155 1024,1048576,1073741824,1099511627776,70368744177664, %T A031155 295147905179352825856,9903520314283042199192993792, %U A031155 39614081257132168796771975168,680564733841876926926749214863536422912,95780971304118053647396689196894323976171195136475136,862718293348820473429344482784628181556388621521298319395315527974912 %N A031155 a(n) = 2^A031140(n). %C A031155 Powers of 2 such that there is an increasing number of nonzero digits after the rightmost digit '0'. %Y A031155 Cf. A031140, A031156. %K A031155 nonn,base %O A031155 1,1 %A A031155 _N. J. A. Sloane_ %E A031155 Typo in title corrected by _Sean A. Irvine_, Apr 11 2020