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A028499 6-hyperperfect numbers: n=6(sigma(n)-n-1)+1. 0
301, 16513, 60110701, 1977225901 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

a(5) > 10^12. 2733834545701 and 232630479398401 are also terms. - Donovan Johnson, Nov 03 2011

LINKS

J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

CROSSREFS

Cf. A007593.

Sequence in context: A004226 A070192 A178267 * A145123 A068258 A075407

Adjacent sequences:  A028496 A028497 A028498 * A028500 A028501 A028502

KEYWORD

nonn

AUTHOR

Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu)

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Last modified February 14 04:48 EST 2012. Contains 205570 sequences.