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 A055568 #10 Jun 20 2021 07:35:19 %S A055568 0,1,2,3,4,5,6,7,8,9,13,14,17 %N A055568 Numbers not greater than the sum of digits of their squares. %e A055568 4 is a term because 4^2 = 16 and 1+6 = 7 >= 4. %Y A055568 Cf. A004159, A055569, A055570, A055571, A055572. %K A055568 base,fini,full,nonn %O A055568 1,3 %A A055568 _Henry Bottomley_, May 26 2000