A046834 Internal digits of n^2 include digits of n as subsequence.

50, 60, 250, 500, 600, 760, 1050, 2050, 2500, 3050, 3628, 3710, 3760, 3792, 4050, 4410, 5000, 5010, 5050, 5060, 5250, 6000, 6010, 6050, 6250, 6760, 7050, 7560, 7600, 8050, 8250, 8260, 8882, 9050, 9460, 10050, 10500, 14650, 14651, 20050, 20500