OFFSET
1,1
COMMENTS
a(6) has 145 digits and is too large to display here. - Vincenzo Librandi, Dec 10 2010
LINKS
PROG
(PARI) for(n=1, 200, if(isprime(5*10^n+(10^(n)-1)/9)==1, print1(5*10^n+(10^(n)-1)/9, ", ")))
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Mar 07 2002
EXTENSIONS
More terms from Benoit Cloitre, Mar 09 2002
STATUS
approved