3359941223domain: NAppears in sequencesa(n) = 5*a(n-1) - a(n-2), with a(0) = 2, a(1) = 5.at n=14A003501Numerators of continued fraction convergents to sqrt(21).at n=27A041032Numerators of continued fraction convergents to sqrt(525).at n=13A042004a(n) = 23a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 23.at n=7A090731