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%I #5 Jul 11 2015 00:52:11
%S 1,3,7,8,9,11,12,13,14,16,18,19,21,22,23,24,26,27,28,29,31,32,35,36,
%T 37,38,39,40,43,44,45,46,47,48,49,52,53,54,55,56,57,60,61,62,63,64,66,
%U 69,70,71,72,73,74,77,78,79,80,81,82,83,86,87,88,89,90,91,94,95,96,97,98
%N In base 4, numbers n not of the form k + reverse(k) for any k.
%C Base-4 analog of A067031. Complement of A091678.
%e 31 is a term since 31 (decimal) = 133 and there is no k such that k + reverse(k) = 133 in base 4.
%Y Cf. A091678, A067031.
%K base,easy,nonn
%O 0,2
%A _Klaus Brockhaus_, Jan 28 2004
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