230203domain: NPropertiesPrimalityPrimeyesAppears in sequencesn-th term of the Fibonacci-type sequence x(1)=1, x(2)=Fibonacci(n), x(k+1)=x(k)+x(k-1) for k>1.at n=14A142975Odd integers k such that 5^((k-1)/2) + 1 == 0 (mod k*(k-1)/2).at n=22A337829Prime numbersat n=20454