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A115449 Numbers n such that 4*n^5 - 1 is prime. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

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

MATHEMATICA

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

PROG

(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

CROSSREFS

Cf. A115104, A001912.

Sequence in context: A249096 A249367 A257999 * A303851 A218542 A194452

Adjacent sequences:  A115446 A115447 A115448 * A115450 A115451 A115452

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Mar 08 2006

EXTENSIONS

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

More terms from Matthew Conroy, Mar 12 2006

STATUS

approved

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Last modified April 16 05:20 EDT 2021. Contains 343030 sequences. (Running on oeis4.)