Symmetrical numbers, also known as palindrome numbers, are numbers that remain the same when their digits are reversed.
Here are some examples of symmetrical numbers:
- Single-digit numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
- Two-digit numbers: 11, 22, 33, 44, 55, 66, 77, 88, 99
- Three-digit numbers: 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212,...999
- Four-digit numbers: 1001, 1111, 1221, 1331, 1441, 1551, 1661, 1771, 1881, 1991, 2002, 2112,...9999
- Larger numbers: 123454321, 78900987
Symmetrical numbers appear frequently in mathematical puzzles and recreational mathematics. Recognizing them is often as simple as checking if the number reads the same forwards and backward.
