It is 25.
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8, 10 24, 26
5
Prime numbers less than 30 are 2 3 5 7 11 13 17 19 23 29 Square numbers less than 30 are 1, 4, 9, 16 and 25.
1, 4, 9, 16 and 25.
the # 6 and the # -5 are 30 less than their square root. 6^2 = 36 > 36 - 6 = 30 -5^2 = 25 (because a negative times a negative = a positive)