The sum of any four odd numbers will never be equal to an odd number.
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There is no set of four consecutive numbers (odd or even) whose sum equals 169.
21. Its factors are 1, 3, 7 and 21 which add to 32.
25. The middle number of the five is 105/5 = 21. The rest are 21-4, 21-2, 21+2, 21+4
93
4p3*3p1 equal to 72 ways