OFFSET
1,1
COMMENTS
Primes of the form (4*10^k - 31)/9. - Vincenzo Librandi, Nov 16 2010
LINKS
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Mar 27 2004
EXTENSIONS
Edited by N. J. A. Sloane, Feb 26 2010
STATUS
approved