2-1=1
3-1=2
4-1=3
6-1=5
x-1=7
12-1=11
prime number 1,2,3,5,7,11,...
answer is 8.
2-1=1
3-1=2
4-1=3
6-1=5
x-1=7
12-1=11
prime number 1,2,3,5,7,11,...
answer is 8.
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