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A257790
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Numbers n such that 6*5^n - 1 is prime.
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1
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0, 1, 2, 5, 11, 28, 65, 72, 361, 479, 494, 599, 1062, 1094, 1193, 2827, 3271, 3388, 3990, 4418, 11178, 16294, 25176, 42500, 68320, 85698, 145259, 159119, 169771
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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(30) > 2*10^5.
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LINKS
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MATHEMATICA
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Select[Range[0, 10000], PrimeQ[6*5^# - 1] &]
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PROG
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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