A111083 Numbers k such that 3*k^2 + 64 is prime.

1, 5, 7, 9, 13, 15, 27, 33, 35, 41, 47, 51, 57, 63, 65, 69, 71, 77, 79, 83, 85, 89, 91, 103, 113, 117, 121, 139, 141, 147, 155, 175, 181, 187, 189, 191, 197, 201, 215, 219, 223, 225, 239, 243, 247, 251, 253, 259, 261, 265, 281, 293, 299

Offset

1,2

Links

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

Example

If k=113 then (3*k^2) + 64 = 38371 (prime).

Mathematica

Select[Range[300], PrimeQ[3*#^2 + 64] &] (* Stefan Steinerberger, Feb 26 2006 *)

Prog

(PARI) is(n)=isprime(3*n^2+64) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A111068, A111069.

Sequence in context: A089193 A302482 A284742 * A050550 A079523 A231271

Adjacent sequences: A111080 A111081 A111082 * A111084 A111085 A111086

Keyword

nonn,easy

Author

Parthasarathy Nambi, Oct 11 2005

Extensions

More terms from Stefan Steinerberger, Feb 26 2006

Status

approved