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Search: id:A090987
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| A090987 |
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Squares of these numbers divide Bernoulli numerators mentioned in A090997. |
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+0
6
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| 5, 7, 5, 7, 103, 11, 5, 37, 7, 13, 5, 7, 5, 11, 7, 5, 17, 5, 13, 7, 19, 11, 5, 17, 5, 59, 5, 11, 7, 13, 5, 23, 7
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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It appears that except for irregular primes belonging to A094095[n], such as a(5) = 103, a(8) = 37 and a(26) = 59, all regular prime a(n) = p divide corresponding numerators of the Bernoulli numbers with indices of form 2k*p^2, where k>0 is an integer. - Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 19 2006
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LINKS
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S. S. Wagstaff, Prime factors of the absolute values of Bernoulli numerators
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CROSSREFS
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Cf. A000367, A090997.
Cf. A094095.
Sequence in context: A167133 A144567 A010718 this_sequence A065746 A065478 A109353
Adjacent sequences: A090984 A090985 A090986 this_sequence A090988 A090989 A090990
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KEYWORD
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more,nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 28 2004
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EXTENSIONS
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In view of the phrase "it appears", it is not clear to me that the correctness of this sequence has been rigorously established. - N. J. A. Sloane (njas(AT)research.att.com), Aug 26 2006
More terms from Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 19 2006
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