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Search: id:A068814
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| A068814 |
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Primes with a 2 followed by 1's. |
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+0
1
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| 211, 2111, 2111111111111, 2111111111111111111, 211111111111111111111111, 2111111111111111111111111111111111111111111111111111111111, 21111111111111111111111111111111111111111111111111111111111111111111111111111111\ 1111111111111111111111111111111111111111111111111
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) for(n=1, 200, if(isprime(2*10^n+(10^(n)-1)/9)==1, print1(2*10^n+(10^(n)-1)/9, ", ")))
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CROSSREFS
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Sequence in context: A053072 A086978 A108829 this_sequence A111480 A071367 A069425
Adjacent sequences: A068811 A068812 A068813 this_sequence A068815 A068816 A068817
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 07 2002
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EXTENSIONS
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More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2002
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