A110661 - cp's OEIS frontend

A110661 Triangle read by rows: T(n,k) = total number of divisors of k, k+1, ..., n (1 <= k <= n).

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	2
7	8
8	7
9	5
10	3
11	10
12	9
13	7
14	5
15	2
16	14
17	13
18	11
19	9
20	6
21	4
22	16
23	15
24	13
25	11
26	8
27	6
28	2
29	20
30	19
31	17
32	15
33	12
34	10
35	6
36	4
37	23
38	22
39	20
40	18
41	15
42	13
43	9
44	7
45	3
46	27
47	26
48	24
49	22
50	19
51	17
52	13
53	11
54	7
55	4
56	29
57	28
58	26
59	24
60	21
61	19
62	15
63	13
64	9
65	6
66	2
67	35
68	34
69	32
70	30
71	27
72	25
73	21
74	19
75	15
76	12
77	8
78	6
79	37
80	36
81	34

[1, 3, 2, 5, 4, 2, 8, 7, 5, 3, 10, 9, 7, 5, 2, 14, 13, 11, 9, 6, 4, 16, 15, 13, 11, 8, 6, 2, 20, 19, 17, 15, 12, 10, 6, 4, 23, 22, 20, 18, 15, 13, 9, 7, 3, 27, 26, 24, 22, 19, 17, 13, 11, 7, 4, 29, 28, 26, 24, 21, 19, 15, 13, 9, 6, 2, 35, 34, 32, 30, 27, 25, 21, 19, 15, 12, 8, 6, 37, 36, 34]

cp's OEIS Frontend

A110661 Triangle read by rows: T(n,k) = total number of divisors of k, k+1, ..., n (1 <= k <= n).

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	2
7	8
8	7
9	5
10	3
11	10
12	9
13	7
14	5
15	2
16	14
17	13
18	11
19	9
20	6
21	4
22	16
23	15
24	13
25	11
26	8
27	6
28	2
29	20
30	19
31	17
32	15
33	12
34	10
35	6
36	4
37	23
38	22
39	20
40	18
41	15
42	13
43	9
44	7
45	3
46	27
47	26
48	24
49	22
50	19
51	17
52	13
53	11
54	7
55	4
56	29
57	28
58	26
59	24
60	21
61	19
62	15
63	13
64	9
65	6
66	2
67	35
68	34
69	32
70	30
71	27
72	25
73	21
74	19
75	15
76	12
77	8
78	6
79	37
80	36
81	34

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	2
7	8
8	7
9	5
10	3
11	10
12	9
13	7
14	5
15	2
16	14
17	13
18	11
19	9
20	6
21	4
22	16
23	15
24	13
25	11
26	8
27	6
28	2
29	20
30	19
31	17
32	15
33	12
34	10
35	6
36	4
37	23
38	22
39	20
40	18
41	15
42	13
43	9
44	7
45	3
46	27
47	26
48	24
49	22
50	19
51	17
52	13
53	11
54	7
55	4
56	29
57	28
58	26
59	24
60	21
61	19
62	15
63	13
64	9
65	6
66	2
67	35
68	34
69	32
70	30
71	27
72	25
73	21
74	19
75	15
76	12
77	8
78	6
79	37
80	36
81	34

n	a(n)
1	1
2	3
3	2
4	5
5	4
6	2
7	8
8	7
9	5
10	3
11	10
12	9
13	7
14	5
15	2
16	14
17	13
18	11
19	9
20	6
21	4
22	16
23	15
24	13
25	11
26	8
27	6
28	2
29	20
30	19
31	17
32	15
33	12
34	10
35	6
36	4
37	23
38	22
39	20
40	18
41	15
42	13
43	9
44	7
45	3
46	27
47	26
48	24
49	22
50	19
51	17
52	13
53	11
54	7
55	4
56	29
57	28
58	26
59	24
60	21
61	19
62	15
63	13
64	9
65	6
66	2
67	35
68	34
69	32
70	30
71	27
72	25
73	21
74	19
75	15
76	12
77	8
78	6
79	37
80	36
81	34