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
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Oct 08 2002
STATUS
approved