[求助] 數列一問
請問一下~~
數列2、2、3、4、9、14、19、…,若依其循環,試問此數列中第20個數是多少?
答案:84
一直沒有頭緒~~
所以上來求助一下~~
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推
03/14 01:25, , 1F
03/14 01:25, 1F
→
03/14 02:09, , 2F
03/14 02:09, 2F
推
03/14 02:11, , 3F
03/14 02:11, 3F
→
03/14 02:12, , 4F
03/14 02:12, 4F
推
03/14 02:18, , 5F
03/14 02:18, 5F
推
03/14 07:39, , 6F
03/14 07:39, 6F
推
03/14 08:50, , 7F
03/14 08:50, 7F
推
03/14 08:50, , 8F
03/14 08:50, 8F
推
03/14 10:38, , 9F
03/14 10:38, 9F
推
03/14 22:41, , 10F
03/14 22:41, 10F
推
03/17 18:46, , 11F
03/17 18:46, 11F
→
03/17 18:46, , 12F
03/17 18:46, 12F
推
03/17 19:09, , 13F
03/17 19:09, 13F