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Search: id:A056804
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| A056804 |
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Numbers n such that 7*10^n + 1 is prime. |
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+0
4
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| 1, 2, 3, 4, 5, 8, 9, 45, 136, 142, 158, 243, 923, 1235, 2196, 4650, 6119, 7324, 9543, 13494
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Makoto Kamada, Factorizations of 700...001.
Sabin Tabiraca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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MATHEMATICA
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Do[ If[ PrimeQ[ 7*10^n + 1], Print[ n ]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A120430 A057911 A085266 this_sequence A101547 A047597 A005233
Adjacent sequences: A056801 A056802 A056803 this_sequence A056805 A056806 A056807
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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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a(15) - a(20) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005
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