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Search: id:A099017
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| A099017 |
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Numbers n such that 4*10^n + 6*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n. |
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+0
2
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| 1, 2, 6, 10, 12, 13, 22, 32, 46, 61, 68, 90, 110, 652, 1608, 1904, 2003, 3038, 3086, 9580, 9698
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Also numbers n such that (14*10^n+1)/3 is prime.
No others less than 450.
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LINKS
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Makoto Kamada, Factorizations of 466...667.
Index entries for primes involving repunits.
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EXAMPLE
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n = 1, 2, 6 are members since 47, 467, 4666667 are primes.
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MATHEMATICA
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Do[ If[ PrimeQ[(14*10^n + 1)/3], Print[n]], {n, 0, 10000}] (from Robert G. Wilson v Jan 17 2005)
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CROSSREFS
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Cf. A099005, A098959.
Sequence in context: A116043 A085258 A133520 this_sequence A139799 A139710 A057921
Adjacent sequences: A099014 A099015 A099016 this_sequence A099018 A099019 A099020
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KEYWORD
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more,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Nov 13 2004
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EXTENSIONS
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a(14) - a(21) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005
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