37
34 = 17 x 2
35 = 7 x 5
36 = 18 x 2
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All but 31 and 37 are composite.
31,37 are not composite
-20
=(32+34+36+38)/4 = 35
1-36 are numbers, NOT digits. The number of combinations of 10 numbers out of 36 is 36*35*34*33*32*31*30*29*28*27/(10*9*8*7*6*5*4*3*2*1) which is 254,186,856