OFFSET
1,1
COMMENTS
Except for the first two terms, all terms are congruent to 5 (mod 6). - John Cerkan, Sep 07 2016
LINKS
John Cerkan, Table of n, a(n) for n = 1..10000
MAPLE
A023214:=n->`if`(isprime(n) and isprime(4*n+5), n, NULL): seq(A023214(n), n=1..3*10^3); # Wesley Ivan Hurt, Sep 07 2016
MATHEMATICA
Select[Prime[Range[250]], PrimeQ[4#+5]&] (* Harvey P. Dale, Oct 21 2018 *)
PROG
(Magma) [n: n in [0..100000] | IsPrime(n) and IsPrime(4*n+5)] // Vincenzo Librandi, Aug 04 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved