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 A066235 #23 Sep 06 2024 16:52:00 %S A066235 0,1,6,7,8,11,24,26,33,34,35,41,47,49,59,64,76,79,116,159,167,186,253, %T A066235 285,314,345,376,405,413,445,459,478,480,513,520,526,676,710,769,797, %U A066235 833,843,852,898,937,1004,1032,1043,1098,1192,1291,1365,1478,1491,1496 %N A066235 Numbers k such that the sum of digits of k! is a square. %H A066235 Harry J. Smith, <a href="/A066235/b066235.txt">Table of n, a(n) for n = 1..120</a> %t A066235 Select[Range[0,1500],IntegerQ[Sqrt[Total[IntegerDigits[#!]]]]&] (* _Harvey P. Dale_, May 26 2020 *) %o A066235 (PARI) isok(m) = issquare(sumdigits(m!)) \\ _Harry J. Smith_, Feb 07 2010 %Y A066235 Cf. A004152. %K A066235 base,nonn %O A066235 1,3 %A A066235 _Jason Earls_, Dec 19 2001