The number 1880111 is a dihedral prime (or dihedral calculator prime) because on a seven-segment display it is prime (a) forward, (b) upside-down, (c) in a mirror, and (d) in a mirror upside-down. The number 120121 is the smallest dihedral prime that forms four different numbers read in those four ways.
Write a function to list the dihedral primes less than or equal to the input number.
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Last Solution submitted on May 25, 2026

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Chris Cleveland George Berken Augusto Mazzei Christian Schröder

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