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Search: id:A083795
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| A083795 |
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Numbers n such that n and n-1 have the same number of divisors. Numbers not included in A083794. |
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+0
5
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| 3, 15, 22, 27, 34, 35, 39, 45, 58, 76, 86, 87, 94, 95, 99, 105, 117, 119, 123, 134, 136, 142, 143, 146, 148, 159, 172, 178, 190, 202, 203, 206, 214, 215, 218, 219, 231, 232, 243, 244, 245, 254, 286, 297, 299, 302, 303, 327, 333, 335, 345, 375, 376, 382, 388
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also numbers n such that sigma_0(n+1) * sigma_0(n) / (sigma_0(n+1) + sigma_0(n)) = c, c an integer. [From Ctibor O. Zizka (c.zizka(AT)email.cz), Nov 01 2008]
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MAPLE
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with(numtheory): for n from 3 to 10^3 do if tau(n) = tau(n-1) then printf(`%d, `, n) fi: od:
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CROSSREFS
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Cf. A083794.
Sequence in context: A117801 A087674 A009057 this_sequence A083793 A083934 A072200
Adjacent sequences: A083792 A083793 A083794 this_sequence A083796 A083797 A083798
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 07 2003
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EXTENSIONS
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Corrected and extended by James A. Sellers (sellersj(AT)math.psu.edu), May 19, 2003
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