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A273728
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Numbers k such that (17*10^k + 79)/3 is prime.
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0
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1, 2, 3, 5, 7, 12, 37, 45, 55, 139, 205, 264, 445, 975, 1111, 1298, 1340, 1835, 2264, 2317, 2897, 2955, 3001, 4134, 6637, 7063, 20613, 114795, 147890
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OFFSET
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1,2
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COMMENTS
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For k > 1, numbers k such that the digit 5 followed by k-2 occurrences of the digit 6 followed by the digits 93 is prime (see Example section).
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LINKS
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EXAMPLE
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3 is in this sequence because (17*10^3+79)/3 = 5693 is prime.
Initial terms and associated primes:
a(1) = 1, 83;
a(2) = 2, 593;
a(3) = 3, 5693;
a(4) = 5, 566693;
a(5) = 7, 56666693, etc.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[(17*10^# + 79)/3] &]
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PROG
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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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EXTENSIONS
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STATUS
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approved
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