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A110583
Numbers n such that the string 888n is prime.
0
7, 11, 13, 17, 19, 43, 53, 61, 67, 73, 83, 97, 103, 109, 133, 143, 157, 161, 163, 179, 203, 211, 247, 257, 263, 271, 287, 313, 319, 323, 359, 361, 373, 389, 397, 409, 413, 427, 431, 443, 451, 457, 469, 479, 493, 499, 533, 541, 557, 623, 631, 637, 653, 659, 661
OFFSET
1,1
EXAMPLE
If n=73 then 888n = 88873 (prime).
MATHEMATICA
Select[Range[1000], PrimeQ[FromDigits[Join[{8, 8, 8}, IntegerDigits[#]]]]&] (* Harvey P. Dale, Mar 28 2011 *)
CROSSREFS
Sequence in context: A176834 A098414 A293201 * A270999 A103486 A086843
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Sep 12 2005
EXTENSIONS
More terms from Vincenzo Librandi, Mar 27 2010
STATUS
approved