A033857 - OEIS

A033857

Numbers n such that j(n)*phi(n) = usigma(n), where j(n) = A033831, usigma(n) = sum of unitary divisors of n (A034448).

%I #14 Apr 17 2022 19:52:34

%S 35,44,56,105,198,418,1254

%N Numbers n such that j(n)*phi(n) = usigma(n), where j(n) = A033831, usigma(n) = sum of unitary divisors of n (A034448).

%C If it exists, a(8) > 10^9. - _Sean A. Irvine_, Jul 20 2020

%Y Cf. A000010 (phi), A034448 (usigma), A033831.

%K nonn,more

%O 1,1

%A _Naohiro Nomoto_