数学归纳法
前30项:
{{1,1,3},{1,3,3},{1,1,5},{1,3,5},{3,3,5},{1,1,7},{1,3,7},{3,3,7},{1,5,7},{1,1,9},{1,3,9},{1,7,7},{1,5,9},{3,5,9},{1,1,11},{1,3,11},{3,3,11},{1,5,11},{3,5,11},{1,9,9},{1,1,13},{1,3,13},{3,3,13},{1,5,13},{1,9,11},{3,9,11},{1,7,13},{1,1,15},{1,3,15},{1,11,11}}
又:
(2k+1)^2-(2k-1)^2=8k
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