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A277066
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Numbers k such that (266*10^k - 11) / 3 is prime.
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0
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1, 2, 3, 4, 7, 9, 10, 14, 28, 58, 93, 121, 135, 207, 350, 423, 602, 859, 1026, 1864, 1966, 13738, 23299, 28126, 38691, 39403, 47499, 93577, 124022, 177577
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OFFSET
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1,2
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COMMENTS
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For k>0, numbers such that the digits 88 followed by k-1 occurrences of the digit 6 followed by the digit 3 is prime (see Example section).
a(31) > 3*10^5.
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LINKS
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EXAMPLE
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3 is in this sequence because (266*10^3 - 11) / 3 = 88663 is prime.
Initial terms and primes associated:
a(1) = 1, 883;
a(2) = 2, 8863;
a(3) = 3, 88663;
a(4) = 4, 886663;
a(5) = 7, 886666663, etc.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[(266*10^# - 11) / 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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