OFFSET
1,1
COMMENTS
Subsequence of A105760. Except for the first two terms, all terms are congruent to 5 mod 6. - John Cerkan, Sep 07 2016
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MAPLE
A023206:=n->`if`(isprime(n) and isprime(2*n+7), n, NULL): seq(A023206(n), n=1..3*1000); # Wesley Ivan Hurt, Sep 07 2016
MATHEMATICA
Select[Prime@Range@250, PrimeQ[2#+7]&] (* Vladimir Joseph Stephan Orlovsky, Apr 25 2011 *)
PROG
(Magma) [n: n in [0..1000] | IsPrime(n) and IsPrime(2*n+7)]; // Vincenzo Librandi, Nov 20 2010
(PARI) is(n)=isprime(2*n+7) && isprime(n) \\ Charles R Greathouse IV, Sep 07 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved