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

1,1

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.

Links

Table of n, a(n) for n=1..24.

Formula

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

Crossrefs

Cf. A211680 (pairs of deficient numbers).

Cf. A212610 (pairs of primitive deficient numbers).

Sequence in context: A195671 A332428 A212608 * A004005 A381258 A248009

Adjacent sequences: A212608 A212609 A212610 * A212612 A212613 A212614

Keyword

nonn,more

Author

T. D. Noe, May 23 2012

Extensions

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

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

Status

approved