A212611 Primitive deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m (ordered by increasing (smallest possible) m).

135, 3375, 25137, 68607, 22113, 557375, 451737, 1278316, 273, 6739509, 188325, 8775, 9020375, 20365625, 1083537, 3416875, 17875, 1995, 171387125, 382536063, 49166, 366776, 1487640245, 417725

Offset: 1

Author

T. D. Noe, May 23 2012

Keywords

• nonn
• more

Comments

These numbers n = a(k) are listed in the order of increasing companions m = A212612(k). All these numbers appear to have only one companion.

Crossrefs

Cf. A211680 (pairs of deficient numbers).

Cf. A212610 (pairs of primitive deficient numbers).

Formula

a(n) = A212610(2n-1). - M. F. Hasler, Feb 22 2013

Extensions

a(10)-a(18) from Donovan Johnson, May 24 2012

a(19)-a(24) from Donovan Johnson, Jun 06 2012