16,25,36 add to 77. They are the squares of consecutive numbers 4,5,6
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Nothing can fall "between 77". 77 is one number; you need an interval for any numbers to fall BETWEEN.
Half of 154 is 77, so your numbers are 76 and 78.
76 + 77 + 78 three numbers in a row
38 + 39 = 77