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A103069
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Numbers n such that 8*10^n + 3 is prime.
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1
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..7.
Makoto Kamada, Factorizations of 800...003.
Sabin Tabirca and Kieran Reynolds, Lacunary Prime Numbers.
Index entries for primes involving repunits.
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EXAMPLE
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For n = 1 we have 7*10^1+3 = 7*10+3 = 73, which is prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ 8*10^n + 3], Print[ n ]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A222550 A075936 A221902 * A206526 A141877 A057230
Adjacent sequences: A103066 A103067 A103068 * A103070 A103071 A103072
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KEYWORD
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more,nonn
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AUTHOR
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Robert G. Wilson v, Jan 19 2005
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STATUS
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approved
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