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No, not 1 .. i miscalculated.
I just thought of the core remainder,ie., 1 or 102
But why wouldn't it work if
7^51 = 1 mod 103
then (7^51)^2 = 1 mod 103, ie., 7^102 is not div. by 103
Sorry I don't know maths that well nor any theorems... i'm just a school student using my common sense
You said 7^102 is a multiple of 103 .... you should have said it left remainder 1 :)
Anyway i find it pretty hard too .. i'm trying :)