A033857 Numbers n such that j(n)*phi(n) = usigma(n), where j(n) = A033831, usigma(n) = sum of unitary divisors of n (A034448).

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

Offset

1,1

Comments

If it exists, a(8) > 10^9. - Sean A. Irvine, Jul 20 2020

Links

Table of n, a(n) for n=1..7.

Crossrefs

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

Sequence in context: A298156 A167326 A141638 * A110264 A034105 A034115

Adjacent sequences: A033854 A033855 A033856 * A033858 A033859 A033860

Keyword

nonn,more

Author

Naohiro Nomoto

Status

approved