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A103004
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Numbers n such that 5*10^n + 9 is prime.
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1
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1, 2, 3, 5, 8, 20, 29, 86, 283, 757, 1199, 2473, 2733, 24853, 39629, 53492, 71237, 72302, 81653
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Makoto Kamada, Factorizations of 500...009.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
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: A025071 A049908 A135568 * A102016 A002363 A041457
Adjacent sequences: A103001 A103002 A103003 * A103005 A103006 A103007
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KEYWORD
| more,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
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EXTENSIONS
| a(14)-a(19) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010
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