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 A049303 #27 Feb 02 2025 01:15:56 %S A049303 2,5,6,7,9,19,25,32,34,36,41,54,55,56,59,62,64,67,69,70,71,75,80,81, %T A049303 82,84,86,87,89,92,93,95,96,111,115,125,128,140,163,166,177,178,189, %U A049303 192,205,212,219,221,226,233,236,242,258,259,267,294,303,309,323,327,329 %N A049303 Numbers k such that k is a substring of 5^k. %H A049303 Harvey P. Dale, <a href="/A049303/b049303.txt">Table of n, a(n) for n = 1..1000</a> %t A049303 ss5nQ[n_]:=Module[{len=IntegerLength[n]},MemberQ[Partition[ IntegerDigits[ 5^n], len,1],IntegerDigits[n]]]; Select[Range[400],ss5nQ] (* _Harvey P. Dale_, Jan 06 2013 *) %t A049303 Select[Range[350],SequenceCount[IntegerDigits[5^#],IntegerDigits[#]]>0&] (* _Harvey P. Dale_, Dec 27 2024 *) %Y A049303 Cf. A000351, A032740, A049301, A049302, A049304, A049305, A049306, A049307. %K A049303 nonn,base,easy %O A049303 1,1 %A A049303 _David W. Wilson_