A152854 Numbers n such that either 2n+3 is not prime or 4n+7 is not prime.

2, 3, 5, 6, 7, 8, 9, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82

Offset

1,1

Comments

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

Links

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

Mathematica

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

Prog

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

Crossrefs

Sequence in context: A039115 A285964 A198045 * A341763 A201144 A095274

Adjacent sequences: A152851 A152852 A152853 * A152855 A152856 A152857

Keyword

nonn

Author

Vincenzo Librandi, Dec 14 2008

Extensions

Edited and extended by Klaus Brockhaus, Dec 23 2008

Status

approved