10525900321domain: NAppears in sequencesDenominators of continued fraction convergents to sqrt(245).at n=20A041459a(n) = L(13n)/L(n) where L(n) = Lucas number A000204(n).at n=3A153180a(n) = L(8*n+4)/7, where L = A000032 (the Lucas sequence).at n=6A333718