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A103026
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Numbers n such that 6*10^n+7 is prime.
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1
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1, 2, 3, 8, 9, 19, 58, 121, 187, 806, 855, 1019, 2593, 2749, 3016, 4295, 9664, 14927, 34562, 64387, 71299, 71951
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Makoto Kamada, Factorizations of 600...007.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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MATHEMATICA
| Do[ If[ PrimeQ[6*10^n + 7], Print[n]], {n, 0, 10000}]
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CROSSREFS
| Sequence in context: A051209 A093765 A104577 * A098506 A163168 A085453
Adjacent sequences: A103023 A103024 A103025 * A103027 A103028 A103029
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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(18)-a(22) from Kamada link by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 04 2011
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