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A118660 Numbers n such that 4*n^4 + 3 is prime. 2
0, 1, 2, 5, 11, 16, 47, 49, 52, 53, 68, 73, 77, 86, 91, 115, 128, 140, 143, 166, 170, 182, 206, 220, 224, 229, 263, 271, 278, 284, 287, 340, 341, 353, 359, 362, 380, 382, 388, 395, 401, 403, 413, 415, 427, 437, 476, 497, 506, 515, 523, 598, 611, 619, 625, 647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..56.

FORMULA

A000040(k)=4*n^4+3 - R. J. Mathar, May 30 2006

EXAMPLE

If n=91 then 4*n^4 + 3 = 274299847 (prime).

MATHEMATICA

Select[Range[0, 700], PrimeQ[4#^4+3]&] (* Harvey P. Dale, Dec 06 2015 *)

PROG

(PARI) isA118660(n)= { if(isprime(4*n^4+3), return(1), return(0) ); } { for(n=0, 6000, if(isA118660(n)==1, print1(n, ", ") ); ); } - R. J. Mathar, May 30 2006

CROSSREFS

Sequence in context: A024917 A081402 A281023 * A009770 A132121 A070957

Adjacent sequences:  A118657 A118658 A118659 * A118661 A118662 A118663

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, May 24 2006

EXTENSIONS

More terms from R. J. Mathar, May 30 2006

STATUS

approved

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Last modified February 16 08:26 EST 2019. Contains 320159 sequences. (Running on oeis4.)