

A110285


Numbers n such that n*10^n + n  1 is prime.


0




OFFSET

1,1


COMMENTS

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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KEYWORD

more,nonn


AUTHOR



STATUS

approved



