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A276114
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Numbers n such that (101*10^n - 17)/3 is prime.
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0
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1, 2, 15, 17, 26, 41, 56, 59, 121, 137, 224, 506, 611, 836, 937, 1079, 1829, 2315, 2666, 2879, 6661, 7167, 14021, 15459, 32924, 73346, 176815, 177302
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OFFSET
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1,2
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COMMENTS
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Numbers n such that the digits 33 followed by n-1 occurrences of the digit 6 followed by the digit 1 is prime (see Example section).
a(29) > 2*10^5.
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LINKS
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EXAMPLE
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2 is in this sequence because (101*10^2 - 17)/3 = 3361 is prime.
Initial terms and primes associated:
a(1) = 1, 331;
a(2) = 2, 3361;
a(3) = 15, 33666666666666661;
a(4) = 17, 3366666666666666661;
a(5) = 26, 3366666666666666666666666661, etc.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[(101*10^# - 17)/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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