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A068816
Primes formed by a 5 followed by 1's.
1
511111, 5111111111111, 5111111111111111, 5111111111111111111111111111111111111111111111111111111111111111111111111111111111111
OFFSET
1,1
COMMENTS
a(6) has 145 digits and is too large to display here. - Vincenzo Librandi, Dec 10 2010
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
Sequence in context: A249881 A205291 A205899 * A233858 A306952 A336060
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Mar 07 2002
EXTENSIONS
More terms from Benoit Cloitre, Mar 09 2002
STATUS
approved