A228474 - cp's OEIS frontend

A228474 Number of steps required to reach zero in the wrecker ball sequence starting with n: On the k-th step (k = 1, 2, 3, ...) move a distance of k in the direction of zero. If the result has occurred before, move a distance of k away from zero instead. Set a(n) = -1 if 0 is never reached.

n	a(n)
0	0
1	1
2	4
3	2
4	24
5	26
6	3
7	1725
8	12
9	14
10	4
11	26
12	123
13	125
14	15
15	5
16	119
17	781802
18	20
19	22
20	132896
21	6
22	51
23	29
24	31
25	1220793
26	23
27	25
28	7
29	429
30	8869123
31	532009
32	532007
33	532009
34	532011
35	26
36	8
37	94
38	213355
39	213353
40	248
41	33
42	31
43	33
44	1000
45	9
46	144
47	110
48	112
49	82
50	84
51	210
52	60
53	34

[0, 1, 4, 2, 24, 26, 3, 1725, 12, 14, 4, 26, 123, 125, 15, 5, 119, 781802, 20, 22, 132896, 6, 51, 29, 31, 1220793, 23, 25, 7, 429, 8869123, 532009, 532007, 532009, 532011, 26, 8, 94, 213355, 213353, 248, 33, 31, 33, 1000, 9, 144, 110, 112, 82, 84, 210, 60, 34]

cp's OEIS Frontend

A228474 Number of steps required to reach zero in the wrecker ball sequence starting with n: On the k-th step (k = 1, 2, 3, ...) move a distance of k in the direction of zero. If the result has occurred before, move a distance of k away from zero instead. Set a(n) = -1 if 0 is never reached.

Table of values

List of values