A110662 - cp's OEIS frontend

A110662 Triangle read by rows: T(n,k) is the sum of the sums of divisors of k, k+1, ..., n (1 <= k <= n).

n	a(n)
1	1
2	4
3	3
4	8
5	7
6	4
7	15
8	14
9	11
10	7
11	21
12	20
13	17
14	13
15	6
16	33
17	32
18	29
19	25
20	18
21	12
22	41
23	40
24	37
25	33
26	26
27	20
28	8
29	56
30	55
31	52
32	48
33	41
34	35
35	23
36	15
37	69
38	68
39	65
40	61
41	54
42	48
43	36
44	28
45	13
46	87
47	86
48	83
49	79
50	72
51	66
52	54
53	46
54	31
55	18
56	99
57	98
58	95
59	91
60	84
61	78
62	66
63	58
64	43
65	30
66	12
67	127
68	126
69	123
70	119
71	112

[1, 4, 3, 8, 7, 4, 15, 14, 11, 7, 21, 20, 17, 13, 6, 33, 32, 29, 25, 18, 12, 41, 40, 37, 33, 26, 20, 8, 56, 55, 52, 48, 41, 35, 23, 15, 69, 68, 65, 61, 54, 48, 36, 28, 13, 87, 86, 83, 79, 72, 66, 54, 46, 31, 18, 99, 98, 95, 91, 84, 78, 66, 58, 43, 30, 12, 127, 126, 123, 119, 112]

cp's OEIS Frontend

A110662 Triangle read by rows: T(n,k) is the sum of the sums of divisors of k, k+1, ..., n (1 <= k <= n).

Table of values

List of values

n	a(n)
1	1
2	4
3	3
4	8
5	7
6	4
7	15
8	14
9	11
10	7
11	21
12	20
13	17
14	13
15	6
16	33
17	32
18	29
19	25
20	18
21	12
22	41
23	40
24	37
25	33
26	26
27	20
28	8
29	56
30	55
31	52
32	48
33	41
34	35
35	23
36	15
37	69
38	68
39	65
40	61
41	54
42	48
43	36
44	28
45	13
46	87
47	86
48	83
49	79
50	72
51	66
52	54
53	46
54	31
55	18
56	99
57	98
58	95
59	91
60	84
61	78
62	66
63	58
64	43
65	30
66	12
67	127
68	126
69	123
70	119
71	112

n	a(n)
1	1
2	4
3	3
4	8
5	7
6	4
7	15
8	14
9	11
10	7
11	21
12	20
13	17
14	13
15	6
16	33
17	32
18	29
19	25
20	18
21	12
22	41
23	40
24	37
25	33
26	26
27	20
28	8
29	56
30	55
31	52
32	48
33	41
34	35
35	23
36	15
37	69
38	68
39	65
40	61
41	54
42	48
43	36
44	28
45	13
46	87
47	86
48	83
49	79
50	72
51	66
52	54
53	46
54	31
55	18
56	99
57	98
58	95
59	91
60	84
61	78
62	66
63	58
64	43
65	30
66	12
67	127
68	126
69	123
70	119
71	112

n	a(n)
1	1
2	4
3	3
4	8
5	7
6	4
7	15
8	14
9	11
10	7
11	21
12	20
13	17
14	13
15	6
16	33
17	32
18	29
19	25
20	18
21	12
22	41
23	40
24	37
25	33
26	26
27	20
28	8
29	56
30	55
31	52
32	48
33	41
34	35
35	23
36	15
37	69
38	68
39	65
40	61
41	54
42	48
43	36
44	28
45	13
46	87
47	86
48	83
49	79
50	72
51	66
52	54
53	46
54	31
55	18
56	99
57	98
58	95
59	91
60	84
61	78
62	66
63	58
64	43
65	30
66	12
67	127
68	126
69	123
70	119
71	112