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 A265334 #17 Feb 18 2021 01:36:12 %S A265334 1,2,3,6,7,8,9,10,11,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39, %T A265334 40,41,42,43,44,45,46,47,120,121,122,123,124,125,126,127,128,129,130, %U A265334 131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150 %N A265334 Numbers that are >= k! but < 2*k! for some k; numbers whose factorial base representation (A007623) begins with digit "1". %C A265334 Numbers k for which A099563(k) = 1. %C A265334 Numbers k for which A265333(k) = 1. %H A265334 Antti Karttunen, <a href="/A265334/b265334.txt">Table of n, a(n) for n = 1..5915</a> %H A265334 <a href="/index/Fa#facbase">Index entries for sequences related to factorial base representation</a> %e A265334 1 is present as 1 >= 1! but < 2*1! %e A265334 2 is present as 2 >= 2! but < 2*2! %e A265334 3 is present as 3 >= 2! but < 2*2! %e A265334 4 is not present as 4 >= 2! but not < 2*2! (and not >= 3!). %o A265334 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A265334 (define A265334 (NONZERO-POS 1 1 A265333)) %Y A265334 Cf. A007623, A099563, A265333 (characteristic function). %Y A265334 Cf. A059590, A060112 (subsequences). %Y A265334 Cf. also A265897, A265898. %K A265334 nonn %O A265334 1,2 %A A265334 _Antti Karttunen_, Dec 25 2015