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 A110055 Numbers n such that the string 333n is the decimal expansion of a prime number. 0
 1, 11, 17, 29, 31, 43, 47, 49, 53, 59, 77, 91, 101, 103, 107, 131, 139, 161, 187, 197, 209, 227, 233, 253, 269, 271, 283, 287, 299, 323, 331, 337, 341, 349, 367, 383, 397, 419, 427, 433, 439, 449, 451, 457, 479, 491, 493, 497, 503, 517, 533, 539, 563, 581 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE 1 is in the sequence because 3331 is prime. 59 is in the sequence because 33359 is prime. 107 is in the sequence because 333107 is prime. MATHEMATICA Select[Range[1000], PrimeQ[FromDigits[Join[{3, 3, 3}, IntegerDigits[ # ]]]] &] (Delarte) PROG (MAGMA) [ n: n in [1..600] | IsPrime(Seqint(Intseq(n) cat [3, 3, 3])) ]; // Klaus Brockhaus, Feb 03 2011 CROSSREFS Sequence in context: A079367 A120139 A191061 * A240095 A105886 A225493 Adjacent sequences:  A110052 A110053 A110054 * A110056 A110057 A110058 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Sep 04 2005 EXTENSIONS More terms from Alonso del Arte, Sep 06 2005 STATUS approved

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Last modified May 11 09:43 EDT 2021. Contains 343788 sequences. (Running on oeis4.)