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%I #16 Feb 14 2021 13:00:16
%S 1,99,1080,1836,4743,5670,7644,8307,14384,14784,15225,15824,16065,
%T 20300,21584,25704,29760,34544,46816,71568,94240,128412,169290,264160,
%U 266266,312480,331731,364941,404550,445050,454575,458052,479655,497781
%N Numbers k such that phi(k) = Sum_{d|k} core(d) where core(x) is the squarefree part of x (A007913).
%H Donovan Johnson, <a href="/A074786/b074786.txt">Table of n, a(n) for n = 1..500</a>
%o (PARI) isok(n) = eulerphi(n) == sumdiv(n, d, core(d)); \\ _Michel Marcus_, Aug 09 2013
%K nonn
%O 1,2
%A _Benoit Cloitre_, Sep 07 2002
%E More terms from _Michel Marcus_, Aug 09 2013
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