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Search: id:A081357
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| A081357 |
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Sublime numbers, numbers for which the number of divisors and the sum of the divisors are both perfect. |
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+0
2
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| 12, 6086555670238378989670371734243169622657830773351885970528324860512791691264
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(2) was calculated by K. S. Brown
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REFERENCES
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M. J. Halm, More Sequences, Mpossibilities 83, April 2003
C. A. Pickover, Wonders of Numbers, p. 215
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LINKS
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K. S. Brown, Odd Sublime Numbers (posting to sci.math newsgroup)
K. S. Brown, Sublime Numbers
Dean Hickerson, Re: Twelve is special (posting to sci.math newsgroup)
C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
G. Villemin's Almanac of Numbers, Nombres Sublimes
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EXAMPLE
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a(1) = 12 because 12 + 6 + 4 + 3 + 2 + 1 = 28 is perfect and number of divisors, 6, is also perfect
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CROSSREFS
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Adjacent sequences: A081354 A081355 A081356 this_sequence A081358 A081359 A081360
Sequence in context: A116233 A145745 A144546 this_sequence A127708 A094896 A067155
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KEYWORD
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hard,nonn,bref
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AUTHOR
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Michael Joseph Halm (hierogamous(AT)lycos.com), Apr 20 2003
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