1012639687domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(490).at n=13A041934x-values in the solutions to x^2 - 10*y^2 = 9.at n=17A228209Positive numbers m such that m^2 with last digit z deleted is still a perfect square k^2, and z divides m-k.at n=11A343034