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Il y a 5 heures · Four is the smallest non-unitary tetrahedral number. [6] Each natural number divisible by 4 is a difference of squares of two natural numbers, i.e. . A number is a multiple of 4 if its last two digits are a multiple of 4 (for example, 1092 is a multiple of 4 because 92 = 4 × 23 ).
