https://myhomeworkgeeks.com/a-number-a-is-called-a-cubic-residue-modulo-p-if-it-is-congruent-to-a-cube-modulo-p-that-is-if-there-is-a-number-b-such-that-a-b3-mod-p/
A number a is called a cubic residue modulo p if it is congruent to a cube modulo p, that is, if there is a number b such that a = b^3 (mod p).