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A110677
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Numbers k such that the string 3333k is prime.
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1
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1, 23, 31, 37, 41, 49, 67, 83, 97, 103, 119, 131, 133, 163, 199, 203, 217, 221, 233, 251, 257, 263, 277, 283, 301, 307, 311, 313, 331, 373, 383, 391, 397, 401, 419, 427, 431, 433, 439, 469, 481, 497, 509, 511, 527, 593, 601, 611, 619, 641
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OFFSET
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1,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..2500
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EXAMPLE
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k=103 is in the sequence because 3333k = 3333103 is prime.
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MATHEMATICA
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Select[Range[700], PrimeQ[FromDigits[Join[{3, 3, 3, 3}, IntegerDigits[#]]]] &] (* Vincenzo Librandi, Feb 03 2017 *)
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PROG
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(Magma) [n: n in [1..700] | IsPrime(Seqint(Intseq(n) cat [3, 3, 3, 3]))]; // Vincenzo Librandi, Feb 03 2017
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CROSSREFS
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Sequence in context: A356087 A155107 A126719 * A169640 A026051 A141818
Adjacent sequences: A110674 A110675 A110676 * A110678 A110679 A110680
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi, Sep 14 2005
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STATUS
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approved
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