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A097954
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Numbers n such that 7*10^n + 9 is prime.
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1
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1, 2, 4, 6, 11, 12, 13, 35, 46, 57, 128, 156, 263, 353, 396, 429, 783, 982, 1058, 1563, 1695, 1816, 1937, 4236, 4431, 6858, 9898, 13145, 16646, 20891, 63351
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Makoto Kamada, Factorizations of 700...009.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
| n=2 we get 7*10^2+9 = 7*100+9 = 709, which is prime.
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MATHEMATICA
| Do[ If[ PrimeQ[ 7*10^n + 9], Print[ n ]], {n, 0, 10000}] (from Robert G. Wilson v Jan 19 2005)
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CROSSREFS
| Sequence in context: A088906 A063183 A057661 * A081988 A171921 A030783
Adjacent sequences: A097951 A097952 A097953 * A097955 A097956 A097957
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KEYWORD
| more,nonn
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AUTHOR
| Julien Peter Benney (jpbenney(AT)ftml.net), Sep 05 2004
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EXTENSIONS
| a(19)-a(27) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005
a(28)-a(31) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 14 2010
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