A068108 - cp's OEIS frontend

A068108 a(1) = 1; a(n+1) = sum{k|n k<=sqrt(n)} a(k) where sum is over the positive divisors k of n with k <= sqrt(n).

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	2
10	2
11	2
12	1
13	3
14	1
15	2
16	2
17	3
18	1
19	3
20	1
21	3
22	2
23	2
24	1
25	4
26	3
27	2
28	2
29	3
30	1
31	5
32	1
33	3
34	2
35	2
36	3
37	5
38	1
39	2
40	2
41	5
42	1
43	4
44	1
45	3
46	4
47	2
48	1
49	5
50	3
51	4
52	2
53	3
54	1
55	4
56	3
57	5
58	2
59	2
60	1
61	7
62	1
63	2
64	4
65	4
66	3
67	4
68	1
69	3
70	2
71	6
72	1
73	6
74	1
75	2
76	4
77	3
78	3
79	4
80	1
81	6
82	4
83	2
84	1
85	7
86	3
87	2
88	2
89	4
90	1
91	8
92	3
93	3
94	2
95	2
96	3
97	6
98	1
99	4
100	4
101	7
102	1
103	4
104	1
105	4

[1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 2, 1, 3, 1, 2, 2, 3, 1, 3, 1, 3, 2, 2, 1, 4, 3, 2, 2, 3, 1, 5, 1, 3, 2, 2, 3, 5, 1, 2, 2, 5, 1, 4, 1, 3, 4, 2, 1, 5, 3, 4, 2, 3, 1, 4, 3, 5, 2, 2, 1, 7, 1, 2, 4, 4, 3, 4, 1, 3, 2, 6, 1, 6, 1, 2, 4, 3, 3, 4, 1, 6, 4, 2, 1, 7, 3, 2, 2, 4, 1, 8, 3, 3, 2, 2, 3, 6, 1, 4, 4, 7, 1, 4, 1, 4]

cp's OEIS Frontend

A068108 a(1) = 1; a(n+1) = sum{k|n k<=sqrt(n)} a(k) where sum is over the positive divisors k of n with k <= sqrt(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	2
10	2
11	2
12	1
13	3
14	1
15	2
16	2
17	3
18	1
19	3
20	1
21	3
22	2
23	2
24	1
25	4
26	3
27	2
28	2
29	3
30	1
31	5
32	1
33	3
34	2
35	2
36	3
37	5
38	1
39	2
40	2
41	5
42	1
43	4
44	1
45	3
46	4
47	2
48	1
49	5
50	3
51	4
52	2
53	3
54	1
55	4
56	3
57	5
58	2
59	2
60	1
61	7
62	1
63	2
64	4
65	4
66	3
67	4
68	1
69	3
70	2
71	6
72	1
73	6
74	1
75	2
76	4
77	3
78	3
79	4
80	1
81	6
82	4
83	2
84	1
85	7
86	3
87	2
88	2
89	4
90	1
91	8
92	3
93	3
94	2
95	2
96	3
97	6
98	1
99	4
100	4
101	7
102	1
103	4
104	1
105	4

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	2
10	2
11	2
12	1
13	3
14	1
15	2
16	2
17	3
18	1
19	3
20	1
21	3
22	2
23	2
24	1
25	4
26	3
27	2
28	2
29	3
30	1
31	5
32	1
33	3
34	2
35	2
36	3
37	5
38	1
39	2
40	2
41	5
42	1
43	4
44	1
45	3
46	4
47	2
48	1
49	5
50	3
51	4
52	2
53	3
54	1
55	4
56	3
57	5
58	2
59	2
60	1
61	7
62	1
63	2
64	4
65	4
66	3
67	4
68	1
69	3
70	2
71	6
72	1
73	6
74	1
75	2
76	4
77	3
78	3
79	4
80	1
81	6
82	4
83	2
84	1
85	7
86	3
87	2
88	2
89	4
90	1
91	8
92	3
93	3
94	2
95	2
96	3
97	6
98	1
99	4
100	4
101	7
102	1
103	4
104	1
105	4

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	2
10	2
11	2
12	1
13	3
14	1
15	2
16	2
17	3
18	1
19	3
20	1
21	3
22	2
23	2
24	1
25	4
26	3
27	2
28	2
29	3
30	1
31	5
32	1
33	3
34	2
35	2
36	3
37	5
38	1
39	2
40	2
41	5
42	1
43	4
44	1
45	3
46	4
47	2
48	1
49	5
50	3
51	4
52	2
53	3
54	1
55	4
56	3
57	5
58	2
59	2
60	1
61	7
62	1
63	2
64	4
65	4
66	3
67	4
68	1
69	3
70	2
71	6
72	1
73	6
74	1
75	2
76	4
77	3
78	3
79	4
80	1
81	6
82	4
83	2
84	1
85	7
86	3
87	2
88	2
89	4
90	1
91	8
92	3
93	3
94	2
95	2
96	3
97	6
98	1
99	4
100	4
101	7
102	1
103	4
104	1
105	4