A384930 - cp's OEIS frontend

A384930 Irregular triangle read by rows: T(n,k) is the sum of the terms of the (n-k+1)-th 2-dense sublist of divisors of n, with n >= 1, k >= 1.

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

[1, 3, 3, 1, 7, 5, 1, 12, 7, 1, 15, 9, 3, 1, 15, 3, 11, 1, 28, 13, 1, 21, 3, 15, 8, 1, 31, 17, 1, 39, 19, 1, 42, 21, 7, 3, 1, 33, 3, 23, 1, 60, 25, 5, 1, 39, 3, 27, 9, 3, 1, 56, 29, 1, 72, 31, 1, 63, 33, 11, 3, 1, 51, 3, 35, 12, 1, 91, 37, 1, 57, 3, 39, 13, 3, 1, 90, 41, 1, 96, 43, 1, 77, 7, 45, 32, 1]

cp's OEIS Frontend

A384930 Irregular triangle read by rows: T(n,k) is the sum of the terms of the (n-k+1)-th 2-dense sublist of divisors of n, with n >= 1, k >= 1.

Table of values

List of values

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

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

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