1,1

Complement of A152843: Numbers n such that both 2n+3 and 4n+7 are prime.

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

Select[Range[100], !PrimeQ[2#+3]||!PrimeQ[4#+7]&] (* Harvey P. Dale, Jan 18 2012 *)

(MAGMA) [n: n in [0..90] | not IsPrime(2*n+3) or not IsPrime(4*n+7)]; // Vincenzo Librandi, Oct 20 2012

Sequence in context: A285964 A198045 A068998 * A341763 A201144 A095274

Adjacent sequences: A152851 A152852 A152853 * A152855 A152856 A152857

nonn

Vincenzo Librandi, Dec 14 2008

Edited and extended by Klaus Brockhaus, Dec 23 2008

approved