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 A068950 #4 Jun 27 2018 09:33:28 %S A068950 1,4,9,4,7,1,4,9,4,7,9,4,7,1,4,7,9,1,4,7,9,1,4,7,1,4,7,9,1,4,7,9,1,4, %T A068950 7,1,4,7,9,1,4,7,9,1,4,7,1,4,7,1,4,7,9,4,9,1,4,7,9,1,4,9,1,4,7,9,1,4, %U A068950 7,9,1,4,7,9,1,4,7,9,1,4 %N A068950 Digital roots of A068809. %e A068950 a(4)=4 since A068809(4)=49 and so 4+9=13 and 1+3=4. %Y A068950 Cf. A068809, A068949. %K A068950 more,nonn,base %O A068950 1,2 %A A068950 Francois Jooste (phukraut(AT)hotmail.com), Mar 15 2002 %E A068950 a(43)-a(80) from _Giovanni Resta_, Jun 27 2018