A110583 Numbers n such that the string 888n is prime.

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

Links

Table of n, a(n) for n=1..55.

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

Adjacent sequences: A110580 A110581 A110582 * A110584 A110585 A110586

Keyword

nonn,base

Author

Parthasarathy Nambi, Sep 12 2005

Extensions

More terms from Vincenzo Librandi, Mar 27 2010

Status

approved