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# Absolute primes

Absolute primes in a given base ${\displaystyle b}$ are prime numbers which are still prime numbers after any permutation whatsoever of their base ${\displaystyle b}$ digits. The base ${\displaystyle b}$ repunit primes are a subset of the base ${\displaystyle b}$ absolute primes. The base ${\displaystyle b}$ absolute primes are in turn a subset of the permutable primes.