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%I #4 Mar 30 2012 17:39:40
%S 4,7,10,12,13,15,18,19,20,22,23,25,27,28,30,31,34,35,36,37,39,42,43,
%T 44,45,46,47,49,50,51,52,54,55,57,58,60,62,63,66,67,68,69,70,71,73,74,
%U 75,76,77,78,79,82,83,84,85,87,89,90,91,92,94,95,97,98,99,100,102,103,105,106
%N Numbers of the form 1+i^2+j^2+k^2 with 1 <= i <= j <= k.
%C No number == -1 mod 8 is a sum of three squares, so multiples of 8 are missing from this sequence.
%C It appears that numbers == 1 mod 16 are also missing from the sequence.
%F a(n) = 1+A000408(n). [From _R. J. Mathar_, Dec 03 2008]
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Dec 02 2008, Dec 21 2008
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