A105044 Numbers n such that 1000*n - 1 is prime.

2, 3, 5, 9, 14, 26, 33, 36, 42, 50, 53, 57, 60, 71, 72, 74, 78, 80, 86, 95, 99, 101, 102, 105, 108, 134, 135, 137, 138, 140, 144, 158, 162, 165, 173, 180, 183, 185, 189, 192, 200, 203, 204, 213, 222, 224, 231, 240, 243, 248, 254, 261, 267, 269, 273, 276, 278, 287

Offset

1,1

Links

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

Example

If n=2, then 1000*n - 1 = 1000*2 - 1 = 1999 (prime).
If n=99, then 1000*n - 1 = 1000*99 - 1 = 98999 (prime).

Mathematica

Select[Range[300], PrimeQ[1000 # - 1] &] (* Harvey P. Dale, Oct 05 2016 *)

Prog

(Magma) [n: n in [0..100000] | IsPrime(1000*n - 1)]; // Vincenzo Librandi, Nov 13 2010
(PARI) is(n)=isprime(1000*n-1) \\ Charles R Greathouse IV, Jun 12 2017

Crossrefs

Sequence in context: A227375 A032089 A352079 * A026008 A101461 A085897

Adjacent sequences: A105041 A105042 A105043 * A105045 A105046 A105047

Keyword

nonn,easy

Author

Parthasarathy Nambi, Apr 03 2005

Status

approved