A067575 Numbers k that divide phi(k)*bigomega(k).

1, 4, 12, 16, 18, 27, 64, 80, 96, 144, 200, 216, 256, 324, 448, 486, 500, 672, 729, 768, 1008, 1024, 1152, 1250, 1512, 1568, 1728, 2268, 2352, 2560, 2592, 3125, 3402, 3528, 3888, 4096, 5103, 5292, 5488, 5832, 6144, 6400, 7938, 8232

Offset

1,2

Comments

All powers of 4 (A000302) are in the sequence.

Links

Table of n, a(n) for n=1..44.

Mathematica

Select[Range[8300], Mod[EulerPhi[#]PrimeOmega[#], #]==0&] (* Harvey P. Dale, Oct 23 2024 *)

Crossrefs

Cf. A000302, A011775.

Sequence in context: A328840 A255411 A340929 * A193022 A145199 A082420

Adjacent sequences: A067572 A067573 A067574 * A067576 A067577 A067578

Keyword

nonn

Author

Benoit Cloitre, Jan 30 2002

Status

approved