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A101395
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Numbers n such that 4*10^n+7 is prime.
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1
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OFFSET
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1,3
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COMMENTS
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No further terms < 50000.
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LINKS
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FORMULA
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EXAMPLE
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n = 1, 3, 9 are members since 47, 4007 and 4000000007 are primes.
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MATHEMATICA
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Do[ If[ PrimeQ[4*10^n + 7], Print[n]], {n, 0, 10000}]
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PROG
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CROSSREFS
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KEYWORD
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hard,nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Jan 15 2005
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STATUS
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approved
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