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%I #13 Jul 20 2020 01:52:10
%S 3,15,56,102,228,234,384,408,510,864,936,1092,1140,1170,1920,2040,
%T 4320,4680,5460
%N Integers k such that j(k)*d(k)=phi(k), where j = A033831.
%C If it exists, a(20) > 10^9. - _Sean A. Irvine_, Jul 19 2020
%Y Cf. A000005 (d), A000010 (phi), A033831.
%K nonn,more
%O 1,1
%A _Naohiro Nomoto_
%E a(17)-a(19) from _Sean A. Irvine_, Jul 19 2020
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