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Search: id:A004022
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| A004022 |
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Primes of form (10^n - 1)/9 (next terms are for n = 317, 1031, etc.). (Formerly M4816)
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+0 52
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OFFSET
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1,1
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COMMENT
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Also called repunit primes.
The prime repunits, primes with digital product = 1.
The next term is too large to include: see A004023, A046413.
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REFERENCES
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T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976, page 11.
J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
Clifford A. Pickover, A Passion for Mathematics, Wiley, 2005; see p. 60.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..5
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
Andy Steward, Prime Generalized Repunits
S. S. Wagstaff, Jr., The Cunningham Project
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CROSSREFS
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See A046413 for the number of 1's. Cf. A004023.
Adjacent sequences: A004019 A004020 A004021 this_sequence A004023 A004024 A004025
Sequence in context: A072218 A046844 A066953 this_sequence A083344 A063863 A101364
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KEYWORD
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nonn,nice,bref
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AUTHOR
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njas
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