A076354 Numbers n such that 210*n-1 is prime.

2, 4, 5, 6, 9, 10, 11, 13, 14, 16, 18, 19, 21, 24, 27, 28, 29, 30, 32, 35, 36, 41, 42, 43, 44, 48, 49, 50, 51, 55, 57, 61, 63, 65, 66, 69, 70, 73, 75, 76, 86, 87, 90, 92, 94, 95, 97, 99, 102, 104, 106, 107, 108, 110, 116, 119, 121, 125, 126, 127, 128, 130, 131, 135

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Example

n=2: 210*2-1=419 is prime.

Mathematica

Select[Range[300], PrimeQ[210*# - 1] &] (* Vincenzo Librandi, Oct 04 2012 *)

Prog

(Magma) [n: n in [0..150]| IsPrime(210*n - 1)]; // Vincenzo Librandi, Oct 04 2012
(PARI) is(n)=isprime(210*n-1) \\ Charles R Greathouse IV, Jun 12 2017

Crossrefs

Sequence in context: A153218 A063656 A206907 * A361936 A069470 A254820

Adjacent sequences: A076351 A076352 A076353 * A076355 A076356 A076357

Keyword

easy,nonn

Author

Zak Seidov, Oct 08 2002

Status

approved