A071767 Numbers n such that sigma(n) and d(n) are both harmonic (Ore) numbers.

1, 12, 76, 932, 4975, 10636, 14975, 16819, 18716, 19269, 46144, 50699, 99196, 134975, 164421, 205916, 359232, 457792, 462272, 468032, 622436, 624211, 812156, 879836, 1308716, 1700991, 1872731, 2096192, 2195776, 2275136, 2294848, 2361152, 2366528, 3291831

Offset

1,2

Comments

4975 is a term because sigma(4975) = 6200 and d(4975) = 6, both harmonic numbers.

Links

Donovan Johnson, Table of n, a(n) for n = 1..200

Crossrefs

Cf. A000005, A000203, A001599.

Sequence in context: A009839 A190066 A335253 * A161461 A162297 A161858

Adjacent sequences: A071764 A071765 A071766 * A071768 A071769 A071770

Keyword

nonn

Author

Jason Earls, Jun 04 2002

Status

approved