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 A115915 #5 Jul 15 2021 21:25:17 %S A115915 4,5,9,10,11,13,61,87,127,181,241,253,265,287,295,321,323,349,361,363, %T A115915 377,397,407,409,421,451,457,473,481,485,511,515,527,537,541,581,595, %U A115915 631,635,671,695,705,721,731,751,757,763,769,793,805,807,843,851,867 %N A115915 Numbers k such that k + phi(k) is a brilliant number (A078972). %e A115915 295 + phi(295) = 527 = 17*31. %Y A115915 Cf. A078972, A115916. %K A115915 nonn,base %O A115915 1,1 %A A115915 _Giovanni Resta_, Feb 06 2006