A117132 Numbers n such that 5*n^5 + 1 is prime.

8, 14, 32, 80, 138, 144, 236, 284, 302, 342, 344, 390, 420, 438, 446, 510, 542, 546, 570, 612, 638, 644, 680, 690, 696, 768, 794, 804, 812, 816, 822, 834, 866, 888, 908, 942, 960, 1020, 1022, 1148, 1190, 1194, 1224, 1250, 1278, 1358, 1368, 1398, 1434, 1446

Offset

1,1

Links

Table of n, a(n) for n=1..50.

Example

If n=144 then 5*n^5 + 1 = 309586821121 (prime).

Mathematica

Select[Range[2000], PrimeQ[5#^5 + 1] &] (* Stefan Steinerberger and Giovanni Resta, Apr 22 2006 *)

Prog

(PARI) is(n)=isprime(5*n^5+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A089001.

Sequence in context: A227867 A254034 A225606 * A064969 A236332 A220037

Adjacent sequences: A117129 A117130 A117131 * A117133 A117134 A117135

Keyword

nonn,less,easy

Author

Parthasarathy Nambi, Apr 20 2006

Extensions

More terms from Stefan Steinerberger and Giovanni Resta, Apr 22 2006

Status

approved