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

Author

Jon Perry, Dec 28 2001

Keywords

• nonn

Comments

See A066272 for definition of anti-divisor.

Examples

			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.
		

Links

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

Crossrefs

Cf. A066417, A066418, A058838, A066241.