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Search: id:A127725
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| A127725 |
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Numbers n that are 2-imperfect. |
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+0
3
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OFFSET
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1,1
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COMMENT
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This sequence also contains n = 3074457344902430720 = 2^31*5*17*257*65537, which has the product of four Fermat primes (A019434). For this n, 3*n is a 3-imperfect number (A127726). [From T. D. Noe (noe(AT)sspectra.com), Apr 03 2009]
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CROSSREFS
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Cf. A127724 (k-imperfect numbers).
Sequence in context: A110953 A003683 A098519 this_sequence A048014 A094702 A001621
Adjacent sequences: A127722 A127723 A127724 this_sequence A127726 A127727 A127728
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KEYWORD
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nonn
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), Jan 25 2007
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