A370350 - cp's OEIS frontend

A370350 Number of steps to go from n to 1 in a variant of the Collatz iteration x -> (x / 5 if 5 divides x, x + (x+(5-(x mod 5)))/5 otherwise), or -1 if 1 is never reached.

n	a(n)
1	0
2	4
3	3
4	2
5	1
6	7
7	17
8	6
9	16
10	5
11	15
12	5
13	5
14	14
15	4
16	4
17	13
18	11
19	11
20	3
21	12
22	10
23	10
24	20
25	2
26	11
27	9
28	9
29	19
30	8
31	69
32	10
33	8
34	8
35	18
36	17
37	18
38	68
39	9
40	7
41	7
42	8
43	77
44	16
45	17
46	67
47	8
48	17
49	8
50	6
51	7
52	76
53	15
54	7
55	16
56	66
57	7
58	16
59	7
60	6
61	75
62	6
63	75
64	14
65	6
66	6
67	16
68	65
69	6
70	15
71	6
72	15
73	24
74	74

[0, 4, 3, 2, 1, 7, 17, 6, 16, 5, 15, 5, 5, 14, 4, 4, 13, 11, 11, 3, 12, 10, 10, 20, 2, 11, 9, 9, 19, 8, 69, 10, 8, 8, 18, 17, 18, 68, 9, 7, 7, 8, 77, 16, 17, 67, 8, 17, 8, 6, 7, 76, 15, 7, 16, 66, 7, 16, 7, 6, 75, 6, 75, 14, 6, 6, 16, 65, 6, 15, 6, 15, 24, 74]

cp's OEIS Frontend

A370350 Number of steps to go from n to 1 in a variant of the Collatz iteration x -> (x / 5 if 5 divides x, x + (x+(5-(x mod 5)))/5 otherwise), or -1 if 1 is never reached.

Table of values

List of values

n	a(n)
1	0
2	4
3	3
4	2
5	1
6	7
7	17
8	6
9	16
10	5
11	15
12	5
13	5
14	14
15	4
16	4
17	13
18	11
19	11
20	3
21	12
22	10
23	10
24	20
25	2
26	11
27	9
28	9
29	19
30	8
31	69
32	10
33	8
34	8
35	18
36	17
37	18
38	68
39	9
40	7
41	7
42	8
43	77
44	16
45	17
46	67
47	8
48	17
49	8
50	6
51	7
52	76
53	15
54	7
55	16
56	66
57	7
58	16
59	7
60	6
61	75
62	6
63	75
64	14
65	6
66	6
67	16
68	65
69	6
70	15
71	6
72	15
73	24
74	74

n	a(n)
1	0
2	4
3	3
4	2
5	1
6	7
7	17
8	6
9	16
10	5
11	15
12	5
13	5
14	14
15	4
16	4
17	13
18	11
19	11
20	3
21	12
22	10
23	10
24	20
25	2
26	11
27	9
28	9
29	19
30	8
31	69
32	10
33	8
34	8
35	18
36	17
37	18
38	68
39	9
40	7
41	7
42	8
43	77
44	16
45	17
46	67
47	8
48	17
49	8
50	6
51	7
52	76
53	15
54	7
55	16
56	66
57	7
58	16
59	7
60	6
61	75
62	6
63	75
64	14
65	6
66	6
67	16
68	65
69	6
70	15
71	6
72	15
73	24
74	74

n	a(n)
1	0
2	4
3	3
4	2
5	1
6	7
7	17
8	6
9	16
10	5
11	15
12	5
13	5
14	14
15	4
16	4
17	13
18	11
19	11
20	3
21	12
22	10
23	10
24	20
25	2
26	11
27	9
28	9
29	19
30	8
31	69
32	10
33	8
34	8
35	18
36	17
37	18
38	68
39	9
40	7
41	7
42	8
43	77
44	16
45	17
46	67
47	8
48	17
49	8
50	6
51	7
52	76
53	15
54	7
55	16
56	66
57	7
58	16
59	7
60	6
61	75
62	6
63	75
64	14
65	6
66	6
67	16
68	65
69	6
70	15
71	6
72	15
73	24
74	74