A046832 Internal digits of n^2 include digits of n.

50, 60, 74, 250, 278, 463, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 523, 600, 601, 602, 603, 724, 740, 760, 878, 1050, 1276, 1390, 1463, 1523, 1623, 1627, 1774, 1839, 2050, 2500, 2509, 2550, 2574, 2639, 2778, 2780, 2982, 3006, 3018, 3050, 3261