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What is the sum of the composite numbers less than 10?4 + 6 + 8 + 9 = 27
less than 10
02 + 02 = 0; all other numbers squared are greater than 0. Otherwise 25 (= 52) = 32 + 4262 + 82 = 100√100 = 10; √1000 ≈ 31.6, so largest square less than 1000 is 312Between 100 and 1000 there are 31-10 = 21 square numbers (22 if 100 itself is included since 100 = 102)
It is not clear what the question means: there are 31 2-digit numbers that can be expressed as a sum of two squares.
The numbers are 2,3,5, and 7. If you add them together you get 17.