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A093169 Primes of the form 50*R_k + 7, where R_k is the repunit (A002275) of length k. 1
7, 557, 5557, 555557, 5555555557, 555555555555557, 5555555555555555555557, 5555555555555555555555555555555555555555555555555555555555555555555555555555555555555557 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Primes of the form (5*10^k + 13)/9. - Vincenzo Librandi, Nov 16 2010
LINKS
CROSSREFS
Cf. A056686 (corresponding k).
Sequence in context: A182433 A329368 A333208 * A159029 A308582 A332157
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Mar 26 2004
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)