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A102945
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Numbers n such that 10^n + 8*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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OFFSET
| 1,2
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COMMENTS
| Also numbers n such that (17*10^n+1)/9 is prime.
No more terms below 133000 [From Serge Batalov (batalovs(AT)yahoo.com), May 15 2010]
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LINKS
| Makoto Kamada, Factorizations of 188...889.
Index entries for primes involving repunits.
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MATHEMATICA
| Do[ If[ PrimeQ[(17*10^n + 1)/9], Print[n]], {n, 0, 10000}]
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CROSSREFS
| Sequence in context: A089428 A063801 A160320 * A132515 A036300 A169815
Adjacent sequences: A102942 A102943 A102944 * A102946 A102947 A102948
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KEYWORD
| more,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004
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EXTENSIONS
| More PRP terms a(7)-a(10). Sieved with srsieve and tested with Prime95 by Serge Batalov (batalovs(AT)yahoo.com), May 15 2010
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