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A066416
Number of numbers m such that the sum of the anti-divisors of m is n+1.
2
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
Jon Perry, Anti-divisor
Jon Perry, The Anti-divisor [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
KEYWORD
nonn
AUTHOR
Jon Perry, Dec 28 2001
STATUS
approved