A028882 Numbers k such that k^2 - 7 is prime.

3, 6, 12, 18, 24, 36, 48, 54, 60, 66, 90, 96, 108, 132, 138, 156, 162, 174, 186, 192, 204, 216, 222, 228, 240, 246, 270, 306, 318, 330, 360, 366, 384, 390, 408, 438, 450, 468, 474, 480, 492, 498, 522, 570, 576, 582, 606, 612, 618, 624, 636, 642, 660, 678, 708

Offset: 1

Author

Patrick De Geest

Keywords

• nonn

Links

• Edward Jiang, Table of n, a(n) for n = 1..1000
• P. De Geest, Palindromic Quasipronics of the form n(n+x)

Programs

Magma

[n: n in [3..1000] |IsPrime(n^2-7)]; // Vincenzo Librandi, Nov 18 2010

Mathematica

Select[Range[3,800],PrimeQ[#^2-7]&] (* Harvey P. Dale, Jul 21 2013 *)

PARI

for(n=3,1000,if(isprime(n^2-7),print1(n,","))) \\ Edward Jiang, Aug 06 2014