A272025 - cp's OEIS frontend

A272025 Irregular triangle read by rows, n >= 1, 1 <= k <= A038548(n), in which T(n,k) is the sum of the k-th pair of conjugate divisors of n, or T(n,k) is the central divisor of n if such a pair does not exist.

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

[1, 3, 4, 5, 2, 6, 7, 5, 8, 9, 6, 10, 3, 11, 7, 12, 13, 8, 7, 14, 15, 9, 16, 8, 17, 10, 4, 18, 19, 11, 9, 20, 21, 12, 9, 22, 10, 23, 13, 24, 25, 14, 11, 10, 26, 5, 27, 15, 28, 12, 29, 16, 11, 30, 31, 17, 13, 11, 32, 33, 18, 12, 34, 14, 35, 19, 36, 12, 37, 20, 15, 13, 6, 38, 39, 21, 40, 16, 41, 22, 14, 13, 42, 43, 23, 17, 13]

cp's OEIS Frontend

A272025 Irregular triangle read by rows, n >= 1, 1 <= k <= A038548(n), in which T(n,k) is the sum of the k-th pair of conjugate divisors of n, or T(n,k) is the central divisor of n if such a pair does not exist.

Table of values

List of values

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

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

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