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A103051 Numbers n such that 7*10^n + R_n + 8 is prime, where R_n = 11...1 is the repunit (A002275) of length n. +0
2
1, 2, 4, 17, 25, 32, 50, 74, 173, 1724, 2084 (list; graph; listen)
OFFSET

1,2

COMMENT

Also numbers n such that (64*10^n+71)/9 is prime.

LINKS

Makoto Kamada, Factorizations of 711...119.

Index entries for primes involving repunits.

MATHEMATICA

Do[ If[ PrimeQ[(64*10^n + 71)/9], Print[n]], {n, 0, 10000}]

CROSSREFS

Sequence in context: A155951 A118242 A006276 this_sequence A095018 A081356 A018269

Adjacent sequences: A103048 A103049 A103050 this_sequence A103052 A103053 A103054

KEYWORD

more,nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005

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Last modified February 9 11:24 EST 2010. Contains 172296 sequences.


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