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A219223
Numbers n such that (sigma(n)-n)/(tau(n)-1) is a perfect number.
0
30, 121, 252, 8432, 982081, 479499604, 1912369152, 2180771840
OFFSET
1,1
COMMENTS
a(9) > 10^10. - Donovan Johnson, Nov 15 2012
FORMULA
Numbers n such that (sigma(n)-n)/(tau(n)-1) is a perfect number.
CROSSREFS
Sequence in context: A290391 A277451 A042764 * A042766 A042768 A122137
KEYWORD
nonn
AUTHOR
Zdenek Cervenka, Nov 15 2012
EXTENSIONS
a(6)-a(8) from Donovan Johnson, Nov 15 2012
STATUS
approved