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Search: id:A081677
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| A081677 |
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Numbers n such that 2*10^n + 3 is prime. |
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+0
5
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| 0, 1, 3, 5, 6, 7, 12, 16, 17, 22, 24, 35, 115, 120, 358, 1488, 1819, 4679, 9821
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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Mark A. Herkommer, Number Theory, A Programmer's Guide, McGraw-Hill, New York, 1999, page 51.
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LINKS
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Makoto Kamada, Factorizations of 200...003.
Sabin Tabiraca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
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2+3 is prime, so are 23, 2003, 200003, 2000003, 20000003,
2000000000003, etc. which are all of the form 2*10^n +3.
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MATHEMATICA
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Do[ If[ PrimeQ[2*10^n + 3], Print[n]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A053272 A138927 A030333 this_sequence A086188 A006754 A072134
Adjacent sequences: A081674 A081675 A081676 this_sequence A081678 A081679 A081680
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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), Mar 26 2003
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
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