3351044259domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(75).at n=21A041132a(n) = 4*a(n-1) - a(n-2) for n>1, a(0)=3, a(1)=9.at n=16A082841a(n) = 4*a(n-2) - a(n-4).at n=32A083336