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EXAMPLE
| E.g.: m mod 4 = {0,1,2,3,0,1,2,3,...}; m^2 mod 4 = {0,1,0,1,...}; m^3 mod 4= {0,1,0,3,0,1,0,3,...}; but m^4 mod 4 = {0,1,0,1} = m^2 mod 4; so for higher powers of m these sequences cycle and are not unique, thus for mod 4 we have {0,1,2,3}, {0,1} and {0,1,0,3} as unique and a(4) = 3
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