06-17-2026, 11:01 AM
A strobogrammatic number is a number that appears unchanged when rotated 180 degrees, meaning it looks the same upside down as it does right side up. This property relies on the rotational symmetry of certain digits: 0, 1, and 8 remain the same, while 6 and 9 transform into each other. Examples include 69, 88, 96, 101, 619, and 1001.
Strobogrammatic numbers are a type of numerical ambigram and are related to, but distinct from, palindromic numbers because their symmetry depends on both the numeral shapes and the font used. Some strobogrammatic numbers are also prime numbers, such as 11, 101, and 181, and notable strobogrammatic years include 1881 and 1961, with the next one not occurring until 6009.
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Strobogrammatic numbers are a type of numerical ambigram and are related to, but distinct from, palindromic numbers because their symmetry depends on both the numeral shapes and the font used. Some strobogrammatic numbers are also prime numbers, such as 11, 101, and 181, and notable strobogrammatic years include 1881 and 1961, with the next one not occurring until 6009.
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