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A056805
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Numbers n such that 6*10^n+1 is prime.
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6
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0, 1, 2, 8, 9, 15, 20, 26, 38, 45, 65, 112, 244, 303, 393, 560, 839, 1009, 1019, 1173, 1334, 2236, 2629, 4426, 8848, 20812, 37744, 72926, 86287
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| Makoto Kamada, Factorizations of 600...001.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
| n=2 => (6*10^2+1)=601, which is prime.
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MATHEMATICA
| Do[ If[ PrimeQ[ 6*10^n + 1], Print[ n ]], {n, 0, 10000}]
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CROSSREFS
| Cf. A056716.
Sequence in context: A047353 A032928 A158458 * A046679 A004999 A105125
Adjacent sequences: A056802 A056803 A056804 * A056806 A056807 A056808
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KEYWORD
| more,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 22 2000
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EXTENSIONS
| a(22)-a(25) from Hugo Pfoertner (hugo(AT)pfoertner.org), Feb 11 2004
a(26)=20812 from Kamada link by Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 27 2007
a(27)=37744 from Jason Earls (zevi_35711(AT)yahoo.com), Mar 07 2008
a(28)-a(29) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 09 2010
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