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 A353443 #11 Jul 01 2023 16:54:27 %S A353443 7,13,14,17,19,21,23,27,28,29,34,35,36,37,38,43,44,46,47,49,51,52,53, %T A353443 56,57,58,59,61,63,67,68,69,70,71,76,77,79,81,83,84,85,86,87,89,92,93, %U A353443 94,95,97,98,102,103,107,109,112,113,114,115,116,117,118,119,121,122,126,127 %N A353443 Integers m such that the decimal expansion of 1/m contains the digit 7. %C A353443 If m is a term, 10*m is also a term, so terms with no trailing zeros are all primitive terms. %H A353443 <a href="/index/1#1overn">Index entries for sequences related to decimal expansion of 1/n</a>. %e A353443 m = 7 is a term since 1/7 = 0.142857142857... %e A353443 m = 27 is a term since 1/27 = 0.037037037... (here, 7 is the largest digit). %t A353443 f[n_] := Union[ Flatten[ RealDigits[ 1/n][[1]] ]]; Select[ Range@ 150, MemberQ[f@#, 7] &] %Y A353443 A351473 (largest digit=7) is a subsequence. %Y A353443 Similar with digit k: A352154 (k=0), A353437 (k=1), A353438 (k=2), A353439 (k=3), A353440 (k=4), A353441 (k=5), A353442 (k=6), this sequence (k=7), A353444 (k=8), A333237 (k=9). %K A353443 nonn %O A353443 1,1 %A A353443 _Bernard Schott_ and _Robert G. Wilson v_, Apr 25 2022