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 A045857 #18 Aug 09 2021 02:34:17 %S A045857 6,18,19,55,56,57,58,59,60,61,62,63,174,175,176,177,178,179,180,181, %T A045857 182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198, %U A045857 199,548,549,550,551,552,553,554,555,556,557,558,559,560,561,562,563 %N A045857 Numbers whose square has initial digit '3'. %H A045857 Seiichi Manyama, <a href="/A045857/b045857.txt">Table of n, a(n) for n = 1..10000</a> %t A045857 Select[Range[600],IntegerDigits[#^2][[1]]==3&] (* _Harvey P. Dale_, Jan 09 2020 *) %o A045857 (PARI) isok(n) = digits(n^2)[1] == 3; \\ _Michel Marcus_, May 28 2017 %Y A045857 Cf. A045786. %K A045857 nonn,base %O A045857 1,1 %A A045857 _Jeff Burch_