OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..900
EXAMPLE
13 is prime and 13^4-13-1 (28547) and 13^4-13+1 (28549) are twin primes. So, 13 is a member of this sequence.
MATHEMATICA
Select[Prime[Range[10000]], PrimeQ[#^4 - # - 1] && PrimeQ[#^4 - # + 1]&] (* Vincenzo Librandi, Feb 14 2014 *)
PROG
(Python)
import sympy
from sympy import isprime
{print(n) for n in range(10**6) if isprime(n) and isprime(n**4-n-1) and isprime(n**4-n+1)}
(Magma) [p: p in PrimesUpTo(90000) | IsPrime(p^4-p-1) and IsPrime(p^4-p+1)]; // Vincenzo Librandi, Feb 14 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Derek Orr, Feb 01 2014
STATUS
approved