A215509 Numerator of sigma(n)/n when n belongs to A162657.

1, 3, 4, 7, 6, 13, 8, 15, 13, 21, 12, 31, 14, 31, 26, 31, 18, 49, 20, 63, 32, 45, 24, 65, 31, 49, 40, 57, 30, 91, 32, 63, 52, 63, 48, 91, 38, 75, 56, 93, 42, 127, 44, 93, 121, 93, 48, 127, 57, 93, 80, 105, 54, 121, 72, 127, 80, 105, 60, 217, 62, 127, 104

Offset

1,2

Comments

When p is prime, A162657(p)=p so a(p)=p+1.

Links

Michel Marcus, Table of n, a(n) for n = 1..1000

Example

A162657(2) = 2, so a(2)=numerator(sigma(2)/2)=numerator(3/2)=3.

Crossrefs

Equal to or greater than A214409.

Sequence in context: A324054 A214413 A214409 * A053480 A258052 A344484

Adjacent sequences: A215506 A215507 A215508 * A215510 A215511 A215512

Keyword

nonn

Author

Michel Marcus, Aug 14 2012

Status

approved