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 A061154 #16 Jan 26 2023 14:29:41 %S A061154 148,191,296,592,659,1103,1184,1211,1318,1348,2206,2293,2368,2422, %T A061154 2636,2696,3817,4207,4586,4844,5272,5392,7634,9172,9221,9688,10391, %U A061154 10451,10544,10784,11519,14347,14459,15268,16829,18344,18442,19376,20782,21088,23038,23669 %N A061154 Numbers k such that k*2^m-1 are composites for all exponents m in the range 0<=m<=k. %Y A061154 Cf. A061153, A061155, A061156, A061157, A061158. %K A061154 nonn %O A061154 1,1 %A A061154 _Patrick De Geest_, Apr 15 2001 %E A061154 Offset corrected and a(19)-a(26) from _Sean A. Irvine_, Jan 24 2023 %E A061154 a(27)-a(42) from _Michael S. Branicky_, Jan 26 2023