18477210966domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(40).at n=12A041066a(n) = 6*a(n-1) + a(n-2), starting with a(0)=2 and a(1)=6.at n=13A085447Numbers k such that 10*k^2 + 40 is a square.at n=6A309330