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A068813
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Primes with a 3 followed by 1's.
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0
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OFFSET
| 1,1
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LINKS
| 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
| Digit 3 followed by rep-units of length 1,2,5,10,11,13,34,47,52,77,88,...
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PROG
| (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
| Sequence in context: A125394 A200913 A126552 * A142382 A137318 A029813
Adjacent sequences: A068810 A068811 A068812 * A068814 A068815 A068816
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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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