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A090987
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Squares of these numbers divide Bernoulli numerators mentioned in A090997.
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5
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 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
| S. S. Wagstaff, Prime factors of the absolute values of Bernoulli numerators
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CROSSREFS
| Cf. A000367, A090997.
Cf. A094095.
Sequence in context: A167133 A144567 A010718 * A195498 A065746 A065478
Adjacent sequences: A090984 A090985 A090986 * A090988 A090989 A090990
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KEYWORD
| more,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 28 2004
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EXTENSIONS
| 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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