OFFSET
1,1
COMMENTS
Primes of the form (7*10^k - 43)/9. - Vincenzo Librandi, Nov 16 2010
The next term, a(9), has 264 digits. - Harvey P. Dale, Jul 19 2012
LINKS
MATHEMATICA
Select[Table[FromDigits[PadLeft[{3}, n, 7]], {n, 500}], PrimeQ] (* Harvey P. Dale, Jul 19 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Mar 26 2004
STATUS
approved