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

Author

Jaroslav Krizek, May 02 2009

Keywords

• nonn

Comments

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

Examples

			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.

Formula

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

Extensions

Edited by R. J. Mathar, May 16 2009