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Search: id:A097937
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| A097937 |
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Integers n such that ((10^n)+17)/9 is prime. |
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+0
4
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| 1, 2, 3, 5, 9, 11, 24, 84, 221, 1314, 2952
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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These numbers form a sequence (1)w3 where w is an integer. No others less the 5000.
1314 and 2952 both give primes.- Joao da Silva (zxawyh66(AT)yahoo.com), Sep 30 2005
No others less than 15000; search done with WinPFGW (no new terms found). - Jason Earls (zevi_35711(AT)yahoo.com), Jan 27 2008
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LINKS
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Makoto Kamada, Factorizations of 11...113.
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EXAMPLE
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11113 = ((10^5)+17)/9 and 11113 is prime.
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CROSSREFS
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Cf. A004023.
Sequence in context: A101737 A019276 A097683 this_sequence A124204 A099420 A051147
Adjacent sequences: A097934 A097935 A097936 this_sequence A097938 A097939 A097940
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KEYWORD
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hard,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Sep 05 2004
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