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A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same when rotated 180 degrees.[1] In other words, the numeral looks the same right-side up and upside down (e.g., 69, 96, 1001).[2] A strobogrammatic prime is a strobogrammatic number that is also a prime number, i.e., a number that is only divisible by one and itself (e.g., 11).[3] It is a type of ambigram, words and numbers that retain their meaning when viewed from a different perspective, such as palindromes.[4]