7 = 111_2 = 21_3 = 13_4
13=1101_2=111_3=31_4,因此a(31)=4。[更正人乔恩·肖恩菲尔德2018年9月23日]
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初始术语说明,n≤25:
. ----+---------------------+-----------+-------------------
. 1 | 4 2 2 | 1 | [1] [1]
. 2 | 6 2 3 | 2 | [1,0] [1,1]
. 3 | 9 3 3 | 1 | [1,1,1] [1,1,1]
. 4 | ** 10 2 5 | 6 | [2] [5]
. 5 | ** 14 2 7 | 8 | [2] [7]
. 6 | 15 3 5 | 3 | [1,0] [1,2]
. 7 | 21 3 7 | 3 | [1,0] [2,1]
. 8 | ** 22 2 11 | 12 | [2] [11]
. 9 | 25 5 5 | 1 | [1]^5 [1]^5
. 10 | ** 26 2 13 | 14 | [2] [13]
. 11 | ** 33 3 11 | 12 | [3] [11]
. 12 | ** 34 2 17 | 18 | [2] [17]
. 13 | 35 5 7 | 2 | [1,0,1] [1,1,1]
. 14 | ** 38 2 19 | 20 | [2] [19]
. 15 | ** 39 3 13 | 14 | [3] [13]
. 16 | ** 46 2 23 | 24 | [2] [23]
. 17 | 49 7 7 | 1 | [1]^7 [1]^7
. 18 | ** 51 3 17 | 18 | [3] [17]
. 19 | 55 5 11 | 4 | [1,1] [2,3]
. 20 | ** 57 3 19 | 20 | [3] [19]
. 21 | ** 58 2 29 | 30 | [2] [29]
. 22 | ** 62 2 31 | 32 | [2] [31]
. 23 | 65 5 13 | 4 | [1,1] [3,1]
. 24 | ** 69 3 23 | 24 | [3] [23]
. 25 | ** 74 2 37 | 38 | [2] [37]