Primes p such that f(p) and f(f(p)) are both prime, where f(x) = x^2-x-1.
A238447
Primes p such that f(p) and f(f(p)) are both prime, where f(x) = x^2-x-1.
Terms
- a(0) =3a(1) =487a(2) =617a(3) =677a(4) =751a(5) =1201a(6) =1289a(7) =1579a(8) =1747a(9) =2027a(10) =2267a(11) =2269a(12) =2309a(13) =3259a(14) =3947a(15) =4457a(16) =4567a(17) =4621a(18) =4637a(19) =4799a(20) =4951a(21) =5701a(22) =6029a(23) =6991a(24) =7151a(25) =7687a(26) =7867a(27) =9187a(28) =9209a(29) =9341
External references
- oeis: A238447