clearly there are only 3 integers in the interval which are √36 = 6, √49 = 7, and √64 = 8. √81 = 9 but it is out of range
so 6 +7 +8 = 21
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which are √36 = 6, √49 = 7, and √64 = 8. √81 = 9 but it is out of range