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%I #14 Feb 11 2021 01:28:58
%S 2,26,77,85,194,335,707,1350,2443,2639,9158,9602,15238,16625,19698,
%T 23199,24416,52328,54663,56927,64206,67226,69875,82235,100837,104489,
%U 136213,150040,161268,230216,244572,251488,271215,273208,283492,298205,306878,352660
%N Numbers k such that sigma(sigma(k)) == phi(k) (mod sigma(k)).
%H Donovan Johnson, <a href="/A067204/b067204.txt">Table of n, a(n) for n = 1..500</a>
%o (PARI) for(n=1, 10^8, s=sigma(n); if(sigma(s)%s==eulerphi(n), print(n))) \\ _Donovan Johnson_, Feb 25 2013
%K nonn
%O 1,1
%A _Benoit Cloitre_, Feb 19 2002