2998438562domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(640).at n=17A042228a(n) = 6*a(n-1) + a(n-2), starting with a(0)=2 and a(1)=6.at n=12A085447Numbers n such that (n^2-4)/10 is a square.at n=5A239364