A368198 - cp's OEIS frontend

A368198 a(n) gives the number of ways to go from n to 1 with steps consisting of replacing a positive number without leading zero, say m, appearing in the decimal expansion of a number, by a proper divisor of m.

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	1
8	4
9	2
10	3
11	1
12	9
13	2
14	13
15	4
16	20
17	2
18	31
19	4
20	8
21	4
22	16
23	7
24	54
25	10
26	51
27	10
28	123
29	16
30	14
31	2
32	39
33	7
34	58
35	9
36	118
37	5
38	136
39	17
40	20
41	6
42	55
43	16
44	149
45	25
46	157
47	19
48	459
49	44
50	16
51	5
52	71
53	8
54	138
55	12
56	249
57	13
58	263
59	18
60	47
61	8
62	76
63	33
64	276
65	35
66	336
67	26
68	714
69	87

[1, 1, 1, 2, 1, 3, 1, 4, 2, 3, 1, 9, 2, 13, 4, 20, 2, 31, 4, 8, 4, 16, 7, 54, 10, 51, 10, 123, 16, 14, 2, 39, 7, 58, 9, 118, 5, 136, 17, 20, 6, 55, 16, 149, 25, 157, 19, 459, 44, 16, 5, 71, 8, 138, 12, 249, 13, 263, 18, 47, 8, 76, 33, 276, 35, 336, 26, 714, 87]

cp's OEIS Frontend

A368198 a(n) gives the number of ways to go from n to 1 with steps consisting of replacing a positive number without leading zero, say m, appearing in the decimal expansion of a number, by a proper divisor of m.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	1
8	4
9	2
10	3
11	1
12	9
13	2
14	13
15	4
16	20
17	2
18	31
19	4
20	8
21	4
22	16
23	7
24	54
25	10
26	51
27	10
28	123
29	16
30	14
31	2
32	39
33	7
34	58
35	9
36	118
37	5
38	136
39	17
40	20
41	6
42	55
43	16
44	149
45	25
46	157
47	19
48	459
49	44
50	16
51	5
52	71
53	8
54	138
55	12
56	249
57	13
58	263
59	18
60	47
61	8
62	76
63	33
64	276
65	35
66	336
67	26
68	714
69	87

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	1
8	4
9	2
10	3
11	1
12	9
13	2
14	13
15	4
16	20
17	2
18	31
19	4
20	8
21	4
22	16
23	7
24	54
25	10
26	51
27	10
28	123
29	16
30	14
31	2
32	39
33	7
34	58
35	9
36	118
37	5
38	136
39	17
40	20
41	6
42	55
43	16
44	149
45	25
46	157
47	19
48	459
49	44
50	16
51	5
52	71
53	8
54	138
55	12
56	249
57	13
58	263
59	18
60	47
61	8
62	76
63	33
64	276
65	35
66	336
67	26
68	714
69	87

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	3
7	1
8	4
9	2
10	3
11	1
12	9
13	2
14	13
15	4
16	20
17	2
18	31
19	4
20	8
21	4
22	16
23	7
24	54
25	10
26	51
27	10
28	123
29	16
30	14
31	2
32	39
33	7
34	58
35	9
36	118
37	5
38	136
39	17
40	20
41	6
42	55
43	16
44	149
45	25
46	157
47	19
48	459
49	44
50	16
51	5
52	71
53	8
54	138
55	12
56	249
57	13
58	263
59	18
60	47
61	8
62	76
63	33
64	276
65	35
66	336
67	26
68	714
69	87