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Factorial basis esti djombovos systema en joteri digitoi prostistanti multiplons factorialiom. Pro exemplom, $3:4:0:1:0 = 3(4!) + 4(3!) + 1(1!)$. Visjoinos digitos delgeti esni minor apo factorialed jom prostistati. Esti relatzionaiostos sjom Lehmerove codice i permutatzionbi.

The factorial basis is a number system in which the digits represent multiples of factorials. For example, $3:4:0:1:0 = 3(4!) + 4(3!) + 1(1!)$. Each digit must be lesser than the factorial that it represents. It is related to Lehmer code and permutations.