7883

This number is a prime.

Just showing those entries submitted by 'Keith': (Click here to show all)

Define a sequence by the recurrence a(0)=1, a(1)=1, a(n) = F(n+1)*a(n-1) + F(n)*a(n-2), where F(n) is the nth Fibonacci number. This sequence begins 1, 1, 3, 11, 64, 567, 7883, 172914, 6044619..., with 3, 11, and 7883 being primes. Also, 7883 is the last prime in the sequence, since all terms after 7883 are divisible by 3. [Keith]