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A092480 Primes of the form 40*R_n + 7, where R_n is the repunit (A002275) of length n. +0
1
7, 47, 4447, 4444444447, 44444444444444444447, 44444444444444444444444447 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Cf. A056682 (corresponding n).

Sequence in context: A013403 A013401 A020465 this_sequence A088143 A124880 A081106

Adjacent sequences: A092477 A092478 A092479 this_sequence A092481 A092482 A092483

KEYWORD

nonn

AUTHOR

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Apr 03 2004

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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