1576009domain: NAppears in sequencesa(n) = Fibonacci(n) AND Fibonacci(n+1).at n=40A051122Numbers k for which 10k+1, 10k+3, 10k+7, 10k+9, 10k+13 and 10k+19 are primes.at n=20A178083Numbers k where there are 8 primes between 10*k and 10*k + 30.at n=6A282059