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A028499
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6-hyperperfect numbers: n = 6*(sigma(n)-n-1) + 1.
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7
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OFFSET
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1,1
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COMMENTS
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a(6) > 4*10^12. 232630479398401 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..5.
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, A028500-A028502, A034916.
Sequence in context: A004226 A070192 A178267 * A145123 A068258 A075407
Adjacent sequences: A028496 A028497 A028498 * A028500 A028501 A028502
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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(5) from Donovan Johnson, Nov 20 2012
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STATUS
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approved
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