43 is a Prime number and the next prime number after it is 47
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45
31.
31
The next cube number, after 43 = 64 is 53 = 125.
If you are adding one to the number you subtract each time, then 31 would be the next number. 46 - 1 = 45 45 - 2 = 43 43 - 3 = 40 40 - 4 = 36 36 - 5 = 31, etc...