A173540 - cp's OEIS frontend

A173540 Triangle read by rows in which row n lists the proper nondivisors of n, or zero if n <= 2.

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

[0, 0, 2, 3, 2, 3, 4, 4, 5, 2, 3, 4, 5, 6, 3, 5, 6, 7, 2, 4, 5, 6, 7, 8, 3, 4, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 5, 7, 8, 9, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 2, 3, 4, 5, 6, 7]

cp's OEIS Frontend

A173540 Triangle read by rows in which row n lists the proper nondivisors of n, or zero if n <= 2.

Table of values

List of values

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

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

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