A160134 Nonprimitive e-perfect numbers.

180, 252, 396, 468, 612, 684, 828, 1044, 1116, 1260, 1332, 1476, 1548, 1692, 1908, 1980, 2124, 2196, 2340, 2412, 2556, 2628, 2772, 2844, 2988, 3060, 3204, 3276, 3420, 3492, 3636, 3708, 3852, 3924, 4068, 4140, 4284, 4572, 4716

Offset

1,1

Comments

The nonprimitive e-perfect numbers are e-perfect (A054979) but not primitive e-perfect (A054980).

Links

Table of n, a(n) for n=1..39.

Formula

A054979 \ A054980, where \ is the SET-MINUS symbol.

Example

a(1) = 180, 180 = 5 * 36; 5 is squarefree and relatively prime to the primitive e-perfect number 36, i.e. A054980(1).

Crossrefs

Cf. A051377, A054980.

Sequence in context: A030636 A350372 A179643 * A135193 A095650 A066164

Adjacent sequences: A160131 A160132 A160133 * A160135 A160136 A160137

Keyword

nonn

Author

Jaroslav Krizek, May 02 2009

Extensions

Edited by R. J. Mathar, May 16 2009

Status

approved