In the following number sequence, how many such even numbers are there
which are exactly divisible by its immediate preceding number but not exactly
divisible by its immediate following number ?
3 8 4 1 5 7 2 8 3 4 8 9 3 9 4 2 1 5 8 2
3 8 4 1 5 7 2 [8] 3 4 [8] 9 3 9 4 2 1 5 8 2
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