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i^1=i
i^2=-1
i^3=-i
i^4=1
and so forth
15 divided by 4 leaves a remainder of 3
It is the 15th power.
It is 11 to the 16th power.
115 = 1
815 = 35184372088832
8 to the 15th power
1,000,000,000,000,000
2.078928179
81
1
320,000
215 = 3276832768
1.0715 = 2.759031541 ----------------------
3p9