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A081677
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Numbers n such that 2*10^n + 3 is prime.
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6
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0, 1, 3, 5, 6, 7, 12, 16, 17, 22, 24, 35, 115, 120, 358, 1488, 1819, 4679, 9821, 27217, 27693
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| Mark A. Herkommer, Number Theory, A Programmer's Guide, McGraw-Hill, New York, 1999, page 51.
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LINKS
| Makoto Kamada, Factorizations of 200...003.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
| 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
| Do[ If[ PrimeQ[2*10^n + 3], Print[n]], {n, 0, 10000}]
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CROSSREFS
| Sequence in context: A053272 A138927 A030333 * A082229 A086188 A154535
Adjacent sequences: A081674 A081675 A081676 * A081678 A081679 A081680
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KEYWORD
| more,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 26 2003
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
a(20)-a(21) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 09 2010
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