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 A011534 #23 Feb 24 2019 08:48:50 %S A011534 4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94,104,114,124, %T A011534 134,140,141,142,143,144,145,146,147,148,149,154,164,174,184,194,204, %U A011534 214,224,234,240,241,242,243,244,245,246,247,248,249,254 %N A011534 Numbers that contain a 4. %H A011534 Vincenzo Librandi, <a href="/A011534/b011534.txt">Table of n, a(n) for n = 1..6878</a> %H A011534 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A011534 a(n) ~ n. - _Charles R Greathouse IV_, Feb 12 2017 %t A011534 Select[Range[200], DigitCount[#, 10, 4]>0 &] (* _Vincenzo Librandi_, Feb 14 2017 *) %o A011534 (PARI) is(n)=!!setsearch(Set(digits(n)), 4) \\ _Charles R Greathouse IV_, Feb 12 2017 %o A011534 (GAP) Filtered([1..260],n->4 in ListOfDigits(n)); # _Muniru A Asiru_, Feb 23 2019 %Y A011534 Numbers that contain a digit k: A011531 (k=1), A011532 (k=2), A011533 (k=3), A011535 (k=5), A011536 (k=6), A011537 (k=7), A011538 (k=8), A011539 (k=9), A011540 (k=0). %K A011534 nonn,base,easy %O A011534 1,1 %A A011534 _N. J. A. Sloane_