11 * 11 = 121
111 * 111 = 12.321
1.111 * 1.111 = 1.234.321
11.111 * 11.111 = 123.454.321
111.111 * 111.111 = 12.345.654.321
1.111.111 * 1.111.111 = 1.234.567.654.321
11.111.111 * 11.111.111 = 123.456.787.654.321
111.111.111 * 111.111.111 = 12.345.678.987.654.321