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Search: id:A055720
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| A055720 |
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Numbers n such that d(n)+1 | n. |
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+0
1
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| 3, 4, 10, 15, 28, 35, 54, 55, 63, 64, 65, 85, 95, 98, 100, 115, 125, 135, 144, 145, 147, 155, 156, 175, 176, 185, 189, 205, 215, 234, 235, 245, 260, 265, 295, 297, 305, 335, 336, 351, 355, 364, 365, 395, 400, 408, 415, 416, 445, 459, 485
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Integers divisible by 1 more than the number of their divisors. The only prime is 3.
These numbers can not be very orderly numbers (A167409). [From T. D. Noe (noe(AT)sspectra.com), Nov 13 2009]
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MATHEMATICA
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Select[Range[1000], Mod[ #, 1 + DivisorSigma[0, # ]] == 0 &]
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CROSSREFS
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Adjacent sequences: A055717 A055718 A055719 this_sequence A055721 A055722 A055723
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KEYWORD
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nonn,new
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 09 2000
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EXTENSIONS
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Edited by T. D. Noe (noe(AT)sspectra.com), Nov 13 2009
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