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A028500
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12-hyperperfect numbers: n = 12*(sigma(n)-n-1) + 1.
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3
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OFFSET
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1,1
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COMMENTS
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a(8) > 4*10^12. 7056410014866537089009269921 is also a term. - Donovan Johnson, Nov 20 2012
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LINKS
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Table of n, a(n) for n=1..7.
J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3
Eric Weisstein's World of Mathematics, Hyperperfect Number
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CROSSREFS
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Cf. A000396, A007593, A220290, A028499, A028501-A028502, A034916.
Sequence in context: A137559 A185377 A118059 * A133251 A116338 A157366
Adjacent sequences: A028497 A028498 A028499 * A028501 A028502 A028503
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KEYWORD
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hard,more,nonn
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AUTHOR
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Jud McCranie
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EXTENSIONS
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a(7) from Donovan Johnson, Nov 20 2012
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STATUS
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approved
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