All but 31 and 37 are composite.
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31,37 are not composite
30, 31, 32 and 33
30 + 31 + 32 = 93 ( I forgot how to find this algebraically )
The largest number is 40. The smallest number is 30. 40-30=10.
No it is not. 31*31 = 961 and 32*32=1024. x*x=1000 would be between 31 and 32