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 A067263 #12 Apr 24 2022 06:36:29 %S A067263 2184,6930,7020,7644,17640,18564,23660,25200,27404,71280,83720,120834, %T A067263 129150,179010,189630,191100,198015,224664,228780,273504,285480, %U A067263 302280,304290,322335,328320,335664,437580,443079,449904,451044,462644,478400,483735,619190,627759 %N A067263 Numbers k such that sigma(k+1) = 5*phi(k). %t A067263 Select[Range[7*10^5], DivisorSigma[1,#+1] == 5*EulerPhi[#] &] (* _Amiram Eldar_, Apr 24 2022 *) %Y A067263 Cf. A000010, A000203, A067260, A067261, A067262. %K A067263 nonn %O A067263 1,1 %A A067263 _Benoit Cloitre_, Feb 21 2002 %E A067263 More terms from _Amiram Eldar_, Apr 24 2022