According to the meaning in the question, 5 4 should be decomposed into several consecutive odd sums, assuming that it is n consecutive odd sums (n >；; 1)

1. Multiplied by two odd numbers, it is still an odd number. If 5 4 is odd, it is judged that n is odd, otherwise the sum is even.

2. Because it is a continuous odd number, that is, arithmetic progression, according to arithmetic progression's summation formula, when n is an odd number, the sum of the series must be an integer multiple of n ... so the minimum qualified n is 5, because obviously 5 4 is not a multiple of 3.

Assuming that n is 5, according to the characteristics of arithmetic progression, the average value (that is, the third odd number in the middle) = (5 4)/5 = 625/5 =125.

5^4 = 12 1 + 123 + 125 + 127 + 129