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A102976
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Numbers n such that 3*10^n + 7*R_n - 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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0, 1, 5, 71, 112, 115, 173, 263, 310, 358, 10499, 22925
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OFFSET
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1,3
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COMMENTS
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Also numbers n such that (34*10^n-61)/9 is prime.
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LINKS
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Table of n, a(n) for n=1..12.
Makoto Kamada, Factorizations of 377...771.
Index entries for primes involving repunits.
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MATHEMATICA
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Do[ If[ PrimeQ[(34*10^n-61)/9], Print[n]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A056266 A157860 A125242 * A141852 A142052 A139930
Adjacent sequences: A102973 A102974 A102975 * A102977 A102978 A102979
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KEYWORD
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more,nonn
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AUTHOR
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Robert G. Wilson v, Dec 17 2004
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EXTENSIONS
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Addition of a(11)-a(12) from Kamada data by Robert Price, Dec 13 2010
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STATUS
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approved
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