OFFSET
1,1
COMMENTS
Primes of the form (5*10^k - 23)/9. - Vincenzo Librandi, Nov 16 2010
The next term (a(7)) has 233 digits. - Harvey P. Dale, Mar 04 2024
LINKS
MATHEMATICA
Select[(5(10^Range[74])-23)/9, PrimeQ] (* Paul F. Marrero Romero, Oct 20 2023 *)
Select[Table[FromDigits[PadLeft[{3}, n, 5]], {n, 75}], PrimeQ] (* Harvey P. Dale, Mar 04 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Mar 26 2004
STATUS
approved