A033854 Numbers k such that j(k)*ud(k)=phi(k), j(n) = A033831, ud(n) = number of unitary divisors of n (A034444).

3, 4, 8, 15, 20, 28, 40, 102, 132, 140, 252, 360, 510, 780

Offset

1,1

Comments

If it exists, a(15) > 10^9. - Sean A. Irvine, Jul 20 2020

Links

Table of n, a(n) for n=1..14.

Crossrefs

Cf. A000010 (phi), A033831, A034444.

Sequence in context: A026654 A104370 A310013 * A042981 A337438 A007486

Adjacent sequences: A033851 A033852 A033853 * A033855 A033856 A033857

Keyword

more,nonn

Author

Naohiro Nomoto

Status

approved