Re: Show congruent



I constructed this table at first:

x x^2 mod 8
1 1 0*8+1 1
2 4 0*8+4 4
3 9 1*8+1 1
4 16 2*8+0 0
5 25 3*8+1 1
6 36 4*8+4 4
7 49 6*8+1 1
8 64 8*8+0 0
9 81 10*8+1 1
10 100 12*8+4 4
11 121 15*8+1 1

And I was struggling with 9, 49, 121

.