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A056806
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Numbers n such that 4*10^n + 1 is prime.
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9
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0, 1, 2, 3, 13, 229, 242, 309, 957, 1473, 1494, 3182, 3727, 4177, 23210, 25719, 32835, 36990, 103958
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| Makoto Kamada, Factorizations of 400...001.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Primeform: User group for PFGW & PrimeForm programs.
Index entries for primes involving repunits.
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MATHEMATICA
| Do[ If[ PrimeQ[ 4*10^n + 1], Print[ n ]], {n, 0, 30000}]
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CROSSREFS
| Cf. A056797 9*10^n+1 is prime.
Sequence in context: A113494 A139520 A132535 * A119564 A132358 A090100
Adjacent sequences: A056803 A056804 A056805 * A056807 A056808 A056809
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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(12)-a(16) using PrimeForm from Hugo Pfoertner (hugo(AT)pfoertner.org), Jul 08 2004
a(17)-a(18) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005
Insert new term a(17)=32835 from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010
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