Answers

2016-06-29T14:07:39+08:00
7,9,11,13,15...d2
a1,7. :7+0x2
a2,7+2 :7+1x2
a3,7+2+2 :7+2x2
a4,7+2+2+2:7+3x2
N,7+(N-1)2
7+(105-1)2:7+104x2
a105:7+208
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