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E80E9AAC619831FB
And no, I didn't bruteforce 20.000 years, it's just simple math.
Just as a small hint:
If "x^7" is supposed to end on the digit "3", could "x" ever be a multiple of "2"?
Answer: No.
You've reduced the number of possible values for "x" by 50%.
Last edited by Kerlingen; 06-02-2016 at 19:40.
Reason: Of course it's 20k (=20.000) years. 20 would be far too low. ;)
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