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 A037423 #18 Apr 23 2021 22:19:05 %S A037423 1,2,3,28,37,76,132,137,152,167,183,205,210,217,280,380,407,411,413, %T A037423 431,441,451,455,657,660,676,692,710,711,713,717,888,903,915,917,918, %U A037423 933,941,957,1035,1051,1075,1076,1258,1266,1278,1282,1286,1291,1305 %N A037423 Positive numbers having the same set of digits in base 4 and base 5. %H A037423 John Cerkan, <a href="/A037423/b037423.txt">Table of n, a(n) for n = 1..10000</a> %t A037423 Select[Range@ 1400, Union@ IntegerDigits[#, 4] == Union@ IntegerDigits[#, 5] &] (* _Michael De Vlieger_, Feb 07 2017 *) %o A037423 (PARI) is(n)=Set(digits(n, 4))==Set(digits(n, 5)) \\ _Charles R Greathouse IV_, Feb 11 2017 %K A037423 nonn,base %O A037423 1,2 %A A037423 _Clark Kimberling_ %E A037423 Edited by _Don Reble_, Apr 28 2006 %E A037423 Name edited by _John Cerkan_, Feb 06 2017