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2014-09-30T07:58:19+03:00
1986= 4·496+2   3^1 =3   3²=9  3³=27  3^4=81 ⇒Ucifra(3^1986)=9 1987=2·993+1    4^1=4   4²=16  4³=64   ⇒ Uc(4^1987) = 4     Uc(5^1988)=5 ⇒Uc(a) = Uc(9+4+5) =8