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S = 20 +24 + 28 +.............+48 = 4 (5+6+7+........12) = 4S1 daca s=1+2+...+12 =12×13/2 = 78 și s1 = 1+2+3+4 = 10 ⇒ S1 = s-s1 = 68 ⇒ S= 68×4 = 272 ⇒ 5^272 = 5^2n 2n =272 n=136