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Search: id:A068813
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| A068813 |
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Primes with a 3 followed by 1's. |
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+0
1
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| 31, 311, 311111, 31111111111, 311111111111, 31111111111111, 31111111111111111111111111111111111, 311111111111111111111111111111111111111111111111
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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H. C. Williams, Some primes with interesting digit patterns, Math. Comp. vol 32 no 144 (1978) pp 1306-1310, Table 2, r=3.
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EXAMPLE
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Digit 3 followed by rep-units of length 1,2,5,10,11,13,34,47,52,77,88,...
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PROGRAM
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(PARI) for(n=1, 200, if(isprime(3*10^n+(10^(n)-1)/9)==1, print1(3*10^n+(10^(n)-1)/9, ", ")))
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CROSSREFS
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Adjacent sequences: A068810 A068811 A068812 this_sequence A068814 A068815 A068816
Sequence in context: A042870 A125394 A126552 this_sequence A142382 A137318 A029813
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KEYWORD
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nonn,base
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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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