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The number 2^1993 + 3 is a multiple of  5. What is the units digit of the quotient (2^1993 + 3)/5?

 May 7, 2022
 #1
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(2^1993 + 3)/5 mod 10^10==3829920359 - these are the last 10 digits of the quotient.

 May 7, 2022
 #2
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A similar problem is solved here:
https://web2.0calc.com/questions/inverse-mod#r4

 May 9, 2022

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