715819215724domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(343).at n=21A041648Numerators of continued fraction convergents to sqrt(847).at n=15A042634First class of all proper positive solutions x1(n) = a(n) of the Pell equation x^2 - 7*y^2 = 9.at n=9A307168