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
Offset: 1