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A272523
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Numbers k such that (265*10^k + 17)/3 is prime.
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0
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2, 3, 4, 10, 35, 60, 65, 72, 87, 218, 226, 326, 365, 461, 611, 1244, 1566, 4839, 4913, 5396, 7020, 8410, 9714, 10362, 11405, 21695, 25240, 56076, 56588, 74579, 81990, 114736
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OFFSET
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1,1
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COMMENTS
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For k>1, numbers k such that the digits 88 followed by k-1 occurrences of the digit 3 followed by the digit 9 is prime (see Example section).
a(33) > 2*10^5.
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LINKS
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EXAMPLE
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3 is in this sequence because (265*10^3 + 17)/3 = 88339 is prime.
Initial terms and primes associated:
a(1) = 2, 8839;
a(2) = 3, 88339;
a(3) = 4, 883339;
a(4) = 10, 883333333339;
a(5) = 35, 8833333333333333333333333333333333339, etc.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[(265*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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