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A273726
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Numbers k such that (25*10^k + 59)/3 is prime.
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0
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1, 2, 3, 5, 7, 26, 52, 75, 97, 98, 160, 227, 295, 413, 686, 901, 975, 1088, 1481, 2555, 4001, 4361, 5637, 7568, 8641, 19526, 26633, 92186
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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 8 followed by k-2 occurrences of the digit 3 followed by the digits 53 is prime (see Example section).
a(29) > 2*10^5.
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LINKS
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EXAMPLE
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3 is in this sequence because (25*10^3+59)/3 = 8353 is prime.
Initial terms and associated primes:
a(1) = 1, 103;
a(2) = 2, 853;
a(3) = 3, 8353;
a(4) = 5, 833353;
a(5) = 6, 83333353, etc.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[(25*10^# + 59)/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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STATUS
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approved
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