A111069 Numbers k such that 3*k^2 + 25 is prime.

2, 4, 12, 14, 18, 24, 26, 28, 38, 46, 56, 66, 74, 84, 96, 98, 102, 112, 124, 126, 128, 144, 152, 164, 168, 182, 186, 212, 214, 236, 238, 252, 254, 262, 266, 268, 278, 284, 304, 306, 312, 324, 332, 334, 338, 352, 362, 378, 388, 392, 396

Offset

1,1

Links

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Example

If k=96 then 3*k^2 + 25 = 27673 (prime).

Mathematica

Select[Range[0, 400], PrimeQ[3*#^2 + 25] &] (* Stefan Steinerberger, Mar 03 2006 *)

Prog

(PARI) is(n)=isprime(3*n^2+25) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. A111068.

Sequence in context: A316634 A039587 A194368 * A107295 A039564 A297064

Adjacent sequences: A111066 A111067 A111068 * A111070 A111071 A111072

Keyword

nonn,easy

Author

Parthasarathy Nambi, Oct 08 2005

Extensions

More terms from Stefan Steinerberger, Mar 03 2006

Status

approved