A027758 Primes of the form k^2 + k + 9.

11, 29, 191, 281, 389, 659, 821, 1901, 2459, 3089, 5861, 6329, 7841, 11351, 14051, 14771, 19469, 21179, 22961, 23879, 30809, 36299, 42239, 43481, 44741, 55469, 56891, 64271, 67349, 72101, 73721, 90911, 96419, 137279, 139511

Offset: 1

Author

Patrick De Geest

Keywords

• nonn
• changed

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000
• P. De Geest, World!Of Numbers

Programs

Magma

[ a: k in [0..450] | IsPrime(a) where a is k^2+k+9 ]; // Vincenzo Librandi, Dec 29 2010

Mathematica

Select[Table[k^2+k+9,{k,400}],PrimeQ] (* Harvey P. Dale, Sep 01 2025 *)