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Search: id:A056806
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| A056806 |
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Numbers n such that 4*10^n + 1 is prime. |
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+0
8
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| 0, 1, 2, 3, 13, 229, 242, 309, 957, 1473, 1494, 3182, 3727, 4177, 23210, 25719, 36990, 103958
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Makoto Kamada, Factorizations of 400...001.
Sabin Tabiraca and Kieran Reynolds, Lacunary Prime Numbers.
User group for the PrimeForm program.
Index entries for primes involving repunits.
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MATHEMATICA
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Do[ If[ PrimeQ[ 4*10^n + 1], Print[ n ]], {n, 0, 30000}]
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CROSSREFS
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Cf. A056797 9*10^n+1 is prime.
Sequence in context: A113494 A139520 A132535 this_sequence A119564 A132358 A090100
Adjacent sequences: A056803 A056804 A056805 this_sequence A056807 A056808 A056809
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KEYWORD
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more,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 22 2000
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EXTENSIONS
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Extended using PrimeForm. The next term is > 30000. - Hugo Pfoertner (hugo(AT)pfoertner.org), Jul 08 2004
More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Jul 08 2004
a(16) & a(17) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005
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