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%I #3 Mar 30 2012 18:40:43
%S 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,19,20,21,22,23,24,25,26,27,
%T 28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,
%U 51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73
%N a(1) = 1, a(2) = 2, a(n) = smallest number not the sum of 4th powers of 2 distinct earlier terms.
%C This is to A000583 as A031980 is to A000578. First differs from complement of A088687 at 83522 = 1^4 + 17^4.
%Y Cf. A000583, A031980, A088687.
%K easy,nonn
%O 1,2
%A _Jonathan Vos Post_, Sep 21 2007