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 A049301 #21 Feb 19 2024 01:55:43 %S A049301 7,9,24,28,57,61,62,69,71,72,77,78,80,83,87,89,95,111,162,170,174,185, %T A049301 191,218,222,225,229,232,249,255,259,266,267,286,288,298,314,315,322, %U A049301 328,329,330,332,338,351,352,362,373,376,381,386,387,414,421,435,438 %N A049301 Numbers k such that k is a substring of 3^k. %H A049301 Harvey P. Dale, <a href="/A049301/b049301.txt">Table of n, a(n) for n = 1..1000</a> %t A049301 ssQ[n_]:=MemberQ[Partition[IntegerDigits[3^n],IntegerLength[n],1], IntegerDigits[ n]]; Select[Range[500],ssQ] (* _Harvey P. Dale_, Jul 16 2013 *) %Y A049301 Cf. A000244, A032740, A049302, A049303, A049304, A049305, A049306, A049307. %K A049301 nonn,base,easy %O A049301 1,1 %A A049301 _David W. Wilson_