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(n^2-2=A008865) mod 9. Period 9: repeat 8,2,7,5,5,7,2,8,7.
1

%I #7 Dec 12 2023 09:35:18

%S 8,2,7,5,5,7,2,8,7,8,2,7,5,5,7,2,8,7,8,2,7,5,5,7,2,8,7,8,2,7,5,5,7,2,

%T 8,7,8,2,7,5,5,7,2,8,7,8,2,7,5,5,7,2,8,7

%N (n^2-2=A008865) mod 9. Period 9: repeat 8,2,7,5,5,7,2,8,7.

%K nonn

%O 0,1

%A _Paul Curtz_, Nov 28 2008