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A103003
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Numbers n such that 5*10^n - 3 is prime.
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2
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0, 1, 15, 41, 64, 131, 138, 192, 287, 495, 966, 1091, 1366, 1714, 1774, 3253, 6331, 35326, 36991, 59586, 88261
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Also numbers n such that 4*10^n + 9*R_n - 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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LINKS
| Makoto Kamada, Factorizations of 499...997.
Index entries for primes involving repunits.
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MATHEMATICA
| Do[ If[ PrimeQ[5*10^n - 3], Print[n]], {n, 0, 10000}]
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CROSSREFS
| Sequence in context: A068020 A131991 A116042 * A024845 A056698 A070007
Adjacent sequences: A103000 A103001 A103002 * A103004 A103005 A103006
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KEYWORD
| more,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005
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EXTENSIONS
| Addition of a(17)-a(20) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010
0 added by Arkadiusz Wesolowski (wesolowski(AT)aol.pl), Mar 10 2011
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