A182350 Primes of the form n^4 - 5.

11, 251, 1291, 4091, 20731, 104971, 1048571, 2085131, 9834491, 11316491, 14776331, 18974731, 29986571, 49787131, 78074891, 168896011, 236421371, 406586891, 429981691, 454371851, 479785211, 959512571, 1146228731

Offset

1,1

Links

Table of n, a(n) for n=1..23.

Example

11 = 2^4 - 5; 251 = 4^4 - 5.

Maple

# choose N large, then S is the desired set
f:=n->n^4 - 5:
S:={}:
for n from 0 to N do if(isprime(f(n))) then S:=S union {f(n)}: fi: od:

Mathematica

Select[Range[200]^4-5, PrimeQ] (* Harvey P. Dale, Apr 10 2017 *)

Crossrefs

Cf. A037896.

Sequence in context: A238751 A098672 A056210 * A190680 A089298 A274129

Adjacent sequences: A182347 A182348 A182349 * A182351 A182352 A182353

Keyword

nonn

Author

Patrick Devlin, Apr 25 2012

Status

approved