6361411349domain: NAppears in sequencesPositive integer values of n such that 6*n^2-5 is a square.at n=20A080806a(n)*a(n+3) - a(n+1)*a(n+2) = 5, given a(0)=a(1)=1, a(2)=2.at n=21A080873a(0)=a(1)=1, a(2)=4, a(3)=7, a(n+4) = 10*a(n+2) - a(n).at n=21A152450