coooool

what is the remainder when 736^32 is divided by 13

6 5 12 4 1 3 7 2

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2 solutions

Toby M
May 21, 2021

736 5 ( m o d 13 ) 736 \equiv -5 \pmod {13} , hence 73 6 32 ( 5 ) 32 ( 1 ) 16 1 ( m o d 13 ) 736^{32} \equiv (-5)^{32} \equiv (-1)^{16} \equiv 1 \pmod {13} .

73 6 12 = 1 ( m o d 13 ) , 73 6 3 = 5 ( m o d 13 ) , 736 = 8 ( m o d 13 ) 736^{12}=1 (mod ~ 13),~~~~736^3=5 (mod ~13),~~~736=8 (mod ~13)~~ 73 6 12 + 3 + 1 = 1 5 8 ( m o d 13 ) = 1 ( m o d 13 ) 73 6 2 16 = 1 2 ( m o d 13 ) = 1 ( m o d 13 ) . 1 \therefore ~ 736^{12+3+1}=1*5*8 (mod ~13)=1 (mod 13)\\ \therefore~736^{2*16}=1^2 (mod~ 13)=1 (mod~ 13).~~~~~~~~~~ \boxed{ 1 }

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