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Search: id:A096254
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| A096254 |
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Numbers n such that 5*10^n + 3 is prime. |
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+0
2
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| 1, 2, 3, 8, 18, 20, 31, 42, 103, 175, 181, 531, 706, 1077, 1177, 1552
(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 500...003.
Sabin Tabiraca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
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1, 2 and 3 are in the list because 53, 503 and 5003 are all prime.
500000003 (5*10^8+3) is the next similar is prime, so 8 is the next in the sequence.
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MATHEMATICA
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Do[ If[ PrimeQ[5*10^n + 3], Print[n]], {n, 10000}] (from Robert G. Wilson v Aug 13 2004)
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CROSSREFS
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Sequence in context: A099960 A101182 A009207 this_sequence A091765 A036746 A129955
Adjacent sequences: A096251 A096252 A096253 this_sequence A096255 A096256 A096257
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KEYWORD
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more,nonn
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AUTHOR
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Carl R. White (cyrek(AT)cyreksoft.yorks.com), Aug 10 2004
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EXTENSIONS
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a(12)-a(16) from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 13 2004
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