A137510 - cp's OEIS frontend

A137510 Irregular triangle read by rows in which row n lists the divisors of n in the range 1 < d < n; or 0 if there are no such divisors.

n	a(n)
1	0
2	0
3	0
4	2
5	0
6	2
7	3
8	0
9	2
10	4
11	3
12	2
13	5
14	0
15	2
16	3
17	4
18	6
19	0
20	2
21	7
22	3
23	5
24	2
25	4
26	8
27	0
28	2
29	3
30	6
31	9
32	0
33	2
34	4
35	5
36	10
37	3
38	7
39	2
40	11
41	0
42	2
43	3
44	4
45	6
46	8
47	12
48	5
49	2
50	13
51	3
52	9
53	2
54	4
55	7
56	14
57	0
58	2
59	3
60	5
61	6
62	10
63	15
64	0
65	2
66	4
67	8
68	16
69	3
70	11
71	2
72	17
73	5
74	7
75	2
76	3
77	4
78	6
79	9
80	12
81	18
82	0
83	2
84	19
85	3
86	13
87	2
88	4
89	5
90	8
91	10
92	20
93	0
94	2
95	3
96	6
97	7

[0, 0, 0, 2, 0, 2, 3, 0, 2, 4, 3, 2, 5, 0, 2, 3, 4, 6, 0, 2, 7, 3, 5, 2, 4, 8, 0, 2, 3, 6, 9, 0, 2, 4, 5, 10, 3, 7, 2, 11, 0, 2, 3, 4, 6, 8, 12, 5, 2, 13, 3, 9, 2, 4, 7, 14, 0, 2, 3, 5, 6, 10, 15, 0, 2, 4, 8, 16, 3, 11, 2, 17, 5, 7, 2, 3, 4, 6, 9, 12, 18, 0, 2, 19, 3, 13, 2, 4, 5, 8, 10, 20, 0, 2, 3, 6, 7]

cp's OEIS Frontend

A137510 Irregular triangle read by rows in which row n lists the divisors of n in the range 1 < d < n; or 0 if there are no such divisors.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	2
5	0
6	2
7	3
8	0
9	2
10	4
11	3
12	2
13	5
14	0
15	2
16	3
17	4
18	6
19	0
20	2
21	7
22	3
23	5
24	2
25	4
26	8
27	0
28	2
29	3
30	6
31	9
32	0
33	2
34	4
35	5
36	10
37	3
38	7
39	2
40	11
41	0
42	2
43	3
44	4
45	6
46	8
47	12
48	5
49	2
50	13
51	3
52	9
53	2
54	4
55	7
56	14
57	0
58	2
59	3
60	5
61	6
62	10
63	15
64	0
65	2
66	4
67	8
68	16
69	3
70	11
71	2
72	17
73	5
74	7
75	2
76	3
77	4
78	6
79	9
80	12
81	18
82	0
83	2
84	19
85	3
86	13
87	2
88	4
89	5
90	8
91	10
92	20
93	0
94	2
95	3
96	6
97	7

n	a(n)
1	0
2	0
3	0
4	2
5	0
6	2
7	3
8	0
9	2
10	4
11	3
12	2
13	5
14	0
15	2
16	3
17	4
18	6
19	0
20	2
21	7
22	3
23	5
24	2
25	4
26	8
27	0
28	2
29	3
30	6
31	9
32	0
33	2
34	4
35	5
36	10
37	3
38	7
39	2
40	11
41	0
42	2
43	3
44	4
45	6
46	8
47	12
48	5
49	2
50	13
51	3
52	9
53	2
54	4
55	7
56	14
57	0
58	2
59	3
60	5
61	6
62	10
63	15
64	0
65	2
66	4
67	8
68	16
69	3
70	11
71	2
72	17
73	5
74	7
75	2
76	3
77	4
78	6
79	9
80	12
81	18
82	0
83	2
84	19
85	3
86	13
87	2
88	4
89	5
90	8
91	10
92	20
93	0
94	2
95	3
96	6
97	7

n	a(n)
1	0
2	0
3	0
4	2
5	0
6	2
7	3
8	0
9	2
10	4
11	3
12	2
13	5
14	0
15	2
16	3
17	4
18	6
19	0
20	2
21	7
22	3
23	5
24	2
25	4
26	8
27	0
28	2
29	3
30	6
31	9
32	0
33	2
34	4
35	5
36	10
37	3
38	7
39	2
40	11
41	0
42	2
43	3
44	4
45	6
46	8
47	12
48	5
49	2
50	13
51	3
52	9
53	2
54	4
55	7
56	14
57	0
58	2
59	3
60	5
61	6
62	10
63	15
64	0
65	2
66	4
67	8
68	16
69	3
70	11
71	2
72	17
73	5
74	7
75	2
76	3
77	4
78	6
79	9
80	12
81	18
82	0
83	2
84	19
85	3
86	13
87	2
88	4
89	5
90	8
91	10
92	20
93	0
94	2
95	3
96	6
97	7