A066416 Number of numbers m such that the sum of the anti-divisors of m is n+1.

0, 1, 1, 1, 1, 0, 0, 2, 0, 1, 0, 1, 1, 2, 0, 1, 0, 2, 1, 0, 0, 1, 1, 3, 0, 0, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 0, 0, 1, 1, 1, 3, 0, 0, 0, 2, 0, 1, 0, 1, 0, 3, 0, 1, 1, 3, 1, 3, 0, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 0, 0, 2, 0, 2, 0, 2

Offset

1,8

Comments

See A066272 for definition of anti-divisor.

Links

Table of n, a(n) for n=1..88.

Jon Perry, Anti-divisor

Jon Perry, The Anti-divisor [Cached copy]

Jon Perry, The Anti-divisor: Even More Anti-Divisors [Cached copy]

Example

8 has anti-divisors 1, 3 and 5, whose sum is 9 and 9 has anti-divisors 1, 2 and 6, whose sum is 9 and there are no others. Therefore a(8)=2.

Crossrefs

Cf. A066417, A066418, A058838, A066241.

Sequence in context: A260736 A342656 A293896 * A292342 A091991 A108234

Adjacent sequences: A066413 A066414 A066415 * A066417 A066418 A066419

Keyword

nonn

Author

Jon Perry, Dec 28 2001

Status

approved