141987625933domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(125).at n=16A041226Numerators of continued fraction convergents to sqrt(180).at n=16A041332a(n) = ((4+sqrt(5))*(2+sqrt(5))^n + (4-sqrt(5))*(2-sqrt(5))^n)/2.at n=17A163070