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Search: id:A110285
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| A110285 |
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Numbers n such that n*10^n + n - 1 is prime. |
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+0
1
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OFFSET
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1,1
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COMMENT
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Not proved, only Fermat and Lucas PRPs. Next term is greater than 12000. Concerning primes of the form n * 10^n + n + 1, only n=42 yields one for all n up to 7700.
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CROSSREFS
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Adjacent sequences: A110282 A110283 A110284 this_sequence A110286 A110287 A110288
Sequence in context: A027679 A137863 A157998 this_sequence A070835 A112551 A110075
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KEYWORD
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more,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Sep 07 2005
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