2025 = (20 + 25)2
2025 = (0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)2
2025 = 03 + 13 + 23 + 33 + 43 + 53 + 63 + 73 + 83 + 93