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Search: id:A113853
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| A113853 |
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Numbers whose prime factors are raised to the powers of themselves. |
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+0
1
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| 108, 12500, 84375, 337500, 3294172, 22235661, 88942644, 2573571875, 10294287500, 69486440625, 277945762500, 1141246682444, 7703415106497, 30813660425988, 891598970659375, 1211500426369012, 3566395882637500
(list; graph; listen)
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OFFSET
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4,1
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COMMENT
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Does not include A000312: Number of labeled mappings from n points to themselves (endofunctions): n^n.
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EXAMPLE
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108 = 2^2*3^3. 2 is raised to the power of itself and 3 is raised to the power of itself.
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MATHEMATICA
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p = Drop[Subsets@Prime@Range@7, 8]; Take[ Sort[Times @@@ (p^p)], 18] (* Robert G. Wilson v *)
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PROGRAM
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(PARI) Manually in a Pari session.
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CROSSREFS
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Adjacent sequences: A113850 A113851 A113852 this_sequence A113854 A113855 A113856
Sequence in context: A054624 A143403 A132053 this_sequence A030248 A033535 A077728
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jan 25 2006
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EXTENSIONS
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Corrected and extended by Robert G. Wilson v (rgwv(at)rgwv.com), Jan 26 2006
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