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A165700
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Numbers n such that n*10^(n+1)+1 is prime.
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OFFSET
| 1,2
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COMMENTS
| Numbers n such that the number that begins with n, followed by
n zeros, ends with 1 is prime.
Those numbers corresponding to a(4), a(5) and a(6) are probable primes.
There is no further term up to 14000.
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MATHEMATICA
| Do[If[PrimeQ[n*10^(n+1)+1], Print[n]], {n, 14000}]
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CROSSREFS
| Cf. A068817, A084428.
Sequence in context: A207152 A135059 A203200 * A164135 A119056 A164083
Adjacent sequences: A165697 A165698 A165699 * A165701 A165702 A165703
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KEYWORD
| base,hard,more,nonn
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AUTHOR
| F. Firoozbakht (mymontain(AT)yahoo.com), Sep 25 2009
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