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
Keywords
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Programs
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Magma
[n: n in [0..90] | not IsPrime(2*n+3) or not IsPrime(4*n+7)]; // Vincenzo Librandi, Oct 20 2012
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Mathematica
Select[Range[100],!PrimeQ[2#+3]||!PrimeQ[4#+7]&] (* Harvey P. Dale, Jan 18 2012 *)
Extensions
Edited and extended by Klaus Brockhaus, Dec 23 2008
Comments