A115449 Numbers n such that 4*n^5 - 1 is prime.

1, 2, 3, 8, 12, 23, 27, 42, 68, 75, 86, 96, 113, 117, 125, 135, 140, 146, 168, 182, 185, 188, 191, 198, 233, 245, 255, 267, 281, 287, 297, 306, 311, 318, 327, 360, 362, 366, 377, 390, 392, 395, 408, 416, 423, 432, 447, 456, 465, 486, 488, 497, 516, 531, 555

Offset: 1

Author

Parthasarathy Nambi, Mar 08 2006

Keywords

• nonn

Examples

			If n=96 then (4*n^5 - 1) = 32614907903 (prime).
		

Crossrefs

Cf. A115104, A001912.

Programs

Mathematica

Select[Range[500], PrimeQ[4*#^5 - 1] &] (* Stefan Steinerberger, Mar 09 2006 *)

PARI

for(i=1,2000,if(isprime(4*i^5-1),print1(i,","))) \\ Matthew Conroy, Mar 12 2006

PARI

for(i=1,2000,if(isprime(4*i^5-1),print1(i,","))) \\ Matthew Conroy, Mar 12 2006

Extensions

More terms from Stefan Steinerberger, Zak Seidov and Matthew Conroy, Mar 12 2006

More terms from Matthew Conroy, Mar 12 2006