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 A068949 #8 Jun 27 2018 09:33:12 %S A068949 1,4,9,13,16,19,22,27,31,34,36,40,43,46,49,52,54,55,58,61,63,64,67,70, %T A068949 73,76,79,81,82,85,88,90,91,94,97,100,103,106,108,109,112,115,117,118, %U A068949 121,124,127,130,133,136,139,142,144,148,153,154,157 %N A068949 Digit sums of A068809. %H A068949 Giovanni Resta, <a href="/A068949/b068949.txt">Table of n, a(n) for n = 1..80</a> %e A068949 a(4)=13 since A068809(4)=49, whose digit sum is 4+9 = 13. %Y A068949 Cf. A068809, A068950, A068952, A069324. %K A068949 nonn,base %O A068949 1,2 %A A068949 Francois Jooste (phukraut(AT)hotmail.com), Mar 15 2002 %E A068949 a(42)-a(57) from Kevin Buzzard (k.buzzard(AT)imperial.ac.uk), Jun 20 2008