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 A008540 #15 Aug 12 2023 23:01:48 %S A008540 4,5,14,15,24,25,34,35,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54, %T A008540 55,56,57,58,59,64,65,74,75,84,85,94,95,104,105,114,115,124,125,134, %U A008540 135,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158 %N A008540 Numbers whose American English name contains the letter 'f'. %H A008540 Paolo Xausa, <a href="/A008540/b008540.txt">Table of n, a(n) for n = 1..10000</a> %t A008540 A008540Q[n_]:=StringContainsQ[IntegerName[n,"Words"],"f"];Select[Range[0,200],A008540Q] (* _Paolo Xausa_, Aug 12 2023 *) %Y A008540 Cf. A008519 (o), A008520 (e), A008522 (t), A008536 (n), A008538 (s), A008553 (y). %K A008540 nonn,word %O A008540 1,1 %A A008540 _N. J. A. Sloane_ %E A008540 Name edited by _Paolo Xausa_, Aug 12 2023