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A245241
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Integers n such that 6 * 7^n + 1 is prime.
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3
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0, 1, 4, 9, 99, 412, 2633, 5093, 5632, 28233, 36780, 47084, 53572
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OFFSET
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1,3
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COMMENTS
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All terms correspond to verified primes, that is, not merely probable primes.
a(14) > 2*10^5.
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LINKS
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EXAMPLE
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4 is in this sequence because 6 * 7^4 + 1 = 14407, which is prime.
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MATHEMATICA
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Select[Range[0, 200000], PrimeQ[6 * 7^# + 1] &]
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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