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 A015787 #14 Jul 24 2020 01:47:44 %S A015787 2,18,22,34,46,48,58,94,106,132,150,166,178,180,187,214,274,346,358, %T A015787 394,448,466,488,526,550,562,616,624,634,660,664,744,756,772,778,782, %U A015787 790,798,884,886,898,934,1138,1174,1186,1354,1366,1438,1618 %N A015787 Numbers n such that phi(n) + 8 | sigma(n + 8), where phi = A000010 and sigma = A000203. %C A015787 From _Robert Israel_, Jul 23 2020: (Start) %C A015787 The first odd terms are 187, 2407, 98587, 388315. %C A015787 If p > 5 is in A228353 then 2*p is in the sequence. (End) %H A015787 Robert Israel, <a href="/A015787/b015787.txt">Table of n, a(n) for n = 1..10000</a> %p A015787 select(t -> numtheory:-sigma(t+8) mod (numtheory:-phi(t)+8)=0, [$1..2000]); # _Robert Israel_, Jul 23 2020 %o A015787 (PARI) is(n)=!(sigma(n+8)%(eulerphi(n)+8)) \\ _Charles R Greathouse IV_, Sep 25 2012 %Y A015787 Cf. A000010, A000203, A228353. %K A015787 nonn %O A015787 1,1 %A A015787 _Robert G. Wilson v_ %E A015787 Corrected by _Charles R Greathouse IV_, Sep 25 2012