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 A008461 #11 Jul 08 2025 01:04:33 %S A008461 7,49,97,130,10,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, %T A008461 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, %U A008461 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 %N A008461 Take sum of squares of digits of previous term. %H A008461 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1). %t A008461 NestList[Total[IntegerDigits[#]^2]&,7,100] (* _Harvey P. Dale_, Mar 12 2014 *) %K A008461 nonn,base %O A008461 1,1 %A A008461 _N. J. A. Sloane_