A212644 - cp's OEIS frontend

A212644 If an integer's second signature (cf. A212172) is the n-th to appear among positive integers, a(n) = number of distinct second signatures represented among its divisors.

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

[1, 2, 3, 4, 5, 3, 6, 5, 7, 7, 6, 8, 9, 9, 9, 11, 12, 4, 10, 13, 10, 15, 7, 11, 15, 14, 18, 10, 12, 17, 18, 9, 21, 13, 15, 13, 19, 22, 14, 24, 16, 20, 14, 21, 26, 19, 10, 27, 19, 25, 16, 15, 23, 30, 24, 5, 21, 16, 30, 22, 30, 23, 16, 25, 34, 29, 9, 27, 22, 33]

cp's OEIS Frontend

A212644 If an integer's second signature (cf. A212172) is the n-th to appear among positive integers, a(n) = number of distinct second signatures represented among its divisors.

Table of values

List of values

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

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

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