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A216307
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Values of k such that 10*k+3 and 10*k+9 alone are prime between 10*k and 10*k+9.
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1
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2, 5, 8, 17, 23, 26, 35, 37, 38, 44, 50, 56, 59, 65, 73, 101, 110, 112, 122, 128, 143, 149, 154, 155, 161, 175, 197, 206, 233, 239, 254, 269, 290, 296, 308, 320, 331, 332, 353, 373, 392, 401, 407, 413, 425, 428, 464, 467, 479, 490, 499, 500, 511, 527, 530
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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t = {}; Do[ps = Select[Range[10*n, 10*n + 9], PrimeQ]; If[ps == {10*n + 3, 10*n + 9}, AppendTo[t, n]], {n, 0, 782}]; t (* T. D. Noe, Sep 04 2012 *)
Select[Range[800], Boole[PrimeQ[Range[10 #, 10 #+9]]]=={0, 0, 0, 1, 0, 0, 0, 0, 0, 1}&] (* Harvey P. Dale, Apr 23 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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