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A102932
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Numbers n such that 10^n + 3*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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3
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0, 1, 2, 4, 5, 12, 60, 109, 181, 245, 412, 887, 2477, 2918, 4622, 6240, 6253, 7684, 14630, 20932
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Also numbers n such that (4*10^n+11)/3 is prime.
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LINKS
| Makoto Kamada, Factorizations of 133...337.
Index entries for primes involving repunits.
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MATHEMATICA
| Do[ If[ PrimeQ[(4*10^n + 11)/3], Print[n]], {n, 0, 10000}]
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CROSSREFS
| Sequence in context: A117556 A091071 A050599 * A128457 A139485 A079407
Adjacent sequences: A102929 A102930 A102931 * A102933 A102934 A102935
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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
| Addition of a(18)-a(19) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 10 2010
0 added by Arkadiusz Wesolowski (wesolowski(AT)aol.pl), Mar 10 2011
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