| Serie secventiala cu 8 |
| 1 x 8 + 1 = 9 |
| 12 x 8 + 2 = 98 |
| 123 x 8 + 3 = 987 |
| 1234 x 8 + 4 = 9876 |
| 12345 x 8 + 5 = 98765 |
| 123456 x 8 + 6 = 987654 |
| 1234567 x 8 + 7 = 9876543 |
| 12345678 x 8 + 8 = 98765432 |
| 123456789 x 8 + 9 = 987654321 |
| Serie secventiala de 1 cu 9 |
| 1 x 9 + 2 = 11 |
| 12 x 9 + 3 = 111 |
| 123 x 9 + 4 = 1111 |
| 1234 x 9 + 5 = 11111 |
| 12345 x 9 + 6 = 111111 |
| 123456 x 9 + 7 = 1111111 |
| 1234567 x 9 + 8 = 11111111 |
| 12345678 x 9 + 9 = 111111111 |
| 123456789 x 9 + 10 = 1111111111 |
| Serie secventiala de 8 cu 9 |
| 9 x 9 + 7 = 88 |
| 98 x 9 + 6 = 888 |
| 987 x 9 + 5 = 8888 |
| 9876 x 9 + 4 = 88888 |
| 98765 x 9 + 3 = 888888 |
| 987654 x 9 + 2 = 8888888 |
| 9876543 x 9 + 1 = 88888888 |
| 98765432 x 9 + 0 = 888888888 |
| Palindrom numeric cu 1 |
| 1 x 1 = 1 |
| 11 x 11 = 121 |
| 111 x 111 = 12321 |
| 1111 x 1111 = 1234321 |
| 11111 x 11111 = 123454321 |
| 111111 x 111111 = 12345654321 |
| 1111111 x 1111111 = 1234567654321 |
| 11111111 x 11111111 = 123456787654321 |
| 111111111 x 111111111 = 12345678987654321 |
| Fara 8 |
| 12345679 x 9 = 111111111 |
| 12345679 x 18 = 222222222 |
| 12345679 x 27 = 333333333 |
| 12345679 x 36 = 444444444 |
| 12345679 x 45 = 555555555 |
| 12345679 x 54 = 666666666 |
| 12345679 x 63 = 777777777 |
| 12345679 x 72 = 888888888 |
| 12345679 x 81 = 999999999 |
| Serie secventiala cu 9 |
| 9 x 9 = 81 |
| 99 x 99 = 9801 |
| 999 x 999 = 998001 |
| 9999 x 9999 = 99980001 |
| 99999 x 99999 = 9999800001 |
| 999999 x 999999 = 999998000001 |
| 9999999 x 9999999 = 99999980000001 |
| 99999999 x 99999999 = 9999999800000001 |
| 999999999 x 999999999 = 999999998000000001 |
| Serie secventiala cu 6 |
| 6 x 7 = 42 |
| 66 x 67 = 4422 |
| 666 x 667 = 444222 |
| 6666 x 6667 = 44442222 |
| 66666 x 66667 = 4444422222 |
| 666666 x 666667 = 444444222222 |
| 6666666 x 6666667 = 44444442222222 |
| 66666666 x 66666667 = 4444444422222222 |
| 666666666 x 666666667 = 444444444222222222 |
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