A116947 Numbers n such that 4*n^6 + 1 is prime.

1, 2, 3, 5, 7, 17, 20, 22, 28, 30, 40, 45, 67, 68, 70, 75, 82, 85, 87, 88, 95, 108, 123, 125, 140, 150, 153, 163, 172, 190, 197, 200, 210, 217, 220, 223, 232, 237, 248, 268, 270, 282, 283, 287, 303, 310, 320, 333, 340, 358, 367, 403, 405, 407, 423, 438, 445, 447

Offset

1,2

Links

Table of n, a(n) for n=1..58.

Example

If n=197 then (4*n^6 + 1) is a prime with 15 digits.

Mathematica

Select[Range[500], PrimeQ[(4*#^6 + 1)] &] (* Stefan Steinerberger, Apr 06 2006 *)

Prog

(PARI) is(n)=isprime(4*n^6+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A115104, A001912, A115349.

Sequence in context: A108547 A319823 A286499 * A066277 A360383 A164134

Adjacent sequences: A116944 A116945 A116946 * A116948 A116949 A116950

Keyword

nonn,less,easy

Author

Parthasarathy Nambi, Apr 03 2006

Extensions

More terms from Stefan Steinerberger, Apr 06 2006

Status

approved