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 A207667 #19 Oct 27 2023 08:20:25 %S A207667 1,2,4,6,10,30,70,510,2590,131070,3359230,167247870,8589934590, %T A207667 13985925344264190 %N A207667 Numbers n such that phi(n) divides n+2. %C A207667 Contains 2 * A203966 as a subsequence. - _Max Alekseyev_, Oct 27 2023 %t A207667 Select[Range[50000000],Divisible[#+2,EulerPhi[#]]&] %Y A207667 Cf. A000010, A050474, A207574, A202855, A203966. %K A207667 nonn,more,hard %O A207667 1,2 %A A207667 _José María Grau Ribas_, Feb 19 2012 %E A207667 a(12)-a(13) from _Donovan Johnson_, Mar 01 2012 %E A207667 a(14) from _Max Alekseyev_, Oct 27 2023