Strobogrammatic
A kind of number
About Strobogrammatic
A strobogrammatic number reads the same when rotated 180°. Only digits 0, 1, 6, 8, 9 are used; 6 and 9 swap. For example, 69 → 96 (rotated) and 808 reads the same.
Key features
- Valid digits: 0, 1, 6, 8, 9; 6 and 9 interchange when rotated.
- Single-digit 0, 1, 8 are strobogrammatic; 69 and 96 form a pair.
Examples:
0, 1, 8, 69, 96, 101, 111, 808, 619, 916