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Search: id:A097970
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| A097970 |
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Numbers n such that 7*10^n + 3 is prime. |
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+0
2
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| 1, 4, 6, 16, 22, 39, 103, 163, 240, 1048, 1974, 2559, 5880
(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...003.
Sabin Tabirca and Kieran Reynolds, Lacunary Primes.
Index entries for primes involving repunits.
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EXAMPLE
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For n = 1 we have 7*10^1+3 =7*10+3 = 73, which is prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ 7*10^n + 3], Print[ n ]], {n, 0, 10000}] (from Robert G. Wilson v Jan 19 2005)
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CROSSREFS
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Sequence in context: A117988 A120542 A132344 this_sequence A044858 A120375 A025618
Adjacent sequences: A097967 A097968 A097969 this_sequence A097971 A097972 A097973
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KEYWORD
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more,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Sep 07 2004
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EXTENSIONS
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a(10) - a(13) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005
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