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A068816
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Primes formed by a 5 followed by 1's.
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0
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OFFSET
| 1,1
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COMMENTS
| a(6) has 145 digits and is too large to display here [Vincenzo Librandi, Dec 10 2010]
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LINKS
| Makoto Kamada, Factorizations of 511...11
Index entries for primes involving repunits
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PROG
| (PARI) for(n=1, 200, if(isprime(5*10^n+(10^(n)-1)/9)==1, print1(5*10^n+(10^(n)-1)/9, ", ")))
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CROSSREFS
| Cf. A056713.
Sequence in context: A138207 A205291 A205899 * A087096 A072959 A048527
Adjacent sequences: A068813 A068814 A068815 * A068817 A068818 A068819
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KEYWORD
| nonn,base
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 07 2002
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EXTENSIONS
| More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2002
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