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%I #7 Mar 30 2012 17:38:11
%S 0,1,4,0,7,7,0,4,1,0,100,121,144,160,187,117,130,154,171,100,400,441,
%T 484,430,477,427,460,414,451,400,0,61,34,0,67,37,0,64,31,0,700,781,
%U 774,760,757,747,730,724,711,700,700,711,724,730,747,757,760,774,781,700,0,31,64
%N a(n) = n*n in carryless arithmetic mod 9 in base 10.
%C Addition and multiplication are the same as in school, that is, done in base 10, except that there are no carries and individual digits are added or multiplied mod 9.
%H <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a>
%e 13*13 = 160:
%e ..13
%e ..13
%e ----
%e ..30
%e .13.
%e ----
%e .160
%e ----
%Y Cf. A010878, A169908. See A170990 for a better version.
%K nonn,base
%O 0,3
%A _David Applegate_, _Marc LeBrun_ and _N. J. A. Sloane_, Jul 11 2010
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