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A116899
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Numbers n such that (n concatenated n times)+1 = A000461(n)+1 is a prime number.
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0
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OFFSET
| 1,2
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COMMENTS
| The (probable) prime corresponding to a(4)=3022, i.e., 3022302230...3023 has 12088 digits. Next term is greater than 5000.
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LINKS
| Primeform: User group for PFGW and PrimeForm programs.
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EXAMPLE
| 1, 2 and 6 are terms since 1+1, 22+1 and 666666+1 are prime numbers.
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CROSSREFS
| Cf. A000461.
Sequence in context: A140258 A071093 A114045 * A162146 A055698 A121167
Adjacent sequences: A116896 A116897 A116898 * A116900 A116901 A116902
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KEYWORD
| base,hard,more,nonn
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AUTHOR
| Giovanni Resta (g.resta(AT)iit.cnr.it), Mar 07 2006
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