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 A116027 #9 Jul 15 2021 06:38:01 %S A116027 1,2,3,4,5,6,14,23,28,45,51,55,56,63,161,189,275,543,567,1373,13499, %T A116027 13642,25963,27284,54568,135347,138587,304779,1296346,2592692,5185384, %U A116027 45994399,338193377,419192721,1492937222,1724137953,2453038739,2985874444,4687039999 %N A116027 Numbers k such that k + phi(k) + phi(phi(k)) is a repdigit. %e A116027 5185384 + phi(5185384) + phi(phi(5185384)) = 8888888. %Y A116027 Cf. A010785, A116018. %K A116027 nonn,base %O A116027 1,2 %A A116027 _Giovanni Resta_, Feb 13 2006 %E A116027 a(32)-a(39) from _Donovan Johnson_, Feb 18 2013