A110573 Numbers n such that the string 666n is prime.

1, 17, 29, 43, 53, 83, 97, 109, 119, 139, 143, 167, 173, 187, 191, 203, 229, 233, 269, 277, 301, 329, 353, 403, 427, 431, 433, 437, 439, 461, 467, 493, 511, 527, 529, 541, 557, 559, 599, 607, 637, 643, 647, 649, 667, 671, 683, 697, 707, 727, 733, 737, 749

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

If n=139 then 666n = 666139 (prime).

Mathematica

Select[Range[800], PrimeQ[666*10^IntegerLength[#]+#]&] (* Harvey P. Dale, Oct 04 2019 *)

Crossrefs

Sequence in context: A104228 A049484 A274465 * A190497 A259614 A139840

Adjacent sequences: A110570 A110571 A110572 * A110574 A110575 A110576

Keyword

nonn,base

Author

Parthasarathy Nambi, Sep 12 2005

Extensions

More terms from Vincenzo Librandi, Mar 27 2010

Status

approved