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A061576
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Smallest prime of irregularity index n.
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9
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2, 3, 37, 157, 491, 12613, 78233, 527377, 3238481, 381348997, 1767218027
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OFFSET
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-1,1
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COMMENTS
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By convention 2 has irregularity index -1; regular primes (the first is 3, see A007703) have index 0; an irregular prime of index n >= 1 is an irregular prime p (see A000928) such that p divides exactly n Bernoulli numbers B_{2i} with 2i < p-1.
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REFERENCES
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P. Ribenboim, The New Book of Prime Number Records, Springer-Verlag, NY, 1995, page 326.
Paulo Ribenboim, The Little Book of Bigger Primes, Second Edition, Springer-Verlag, NY, 2004, page 226.
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LINKS
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CROSSREFS
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Cf. A091887, A000928, A007703, A073276, A073277, A060975, A219332, A219333, A219334, A219335, A297848.
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KEYWORD
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nonn,nice,hard,more
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AUTHOR
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EXTENSIONS
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a(8)-a(9) added by Amiram Eldar, Aug 23 2018 from the paper by Hart et al.
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STATUS
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approved
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