A229945 - cp's OEIS frontend

A229945 Triangle read by rows in which row n lists the union of the primes <= n and the divisors of n.

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

[1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 5, 1, 2, 3, 5, 6, 1, 2, 3, 5, 7, 1, 2, 3, 4, 5, 7, 8, 1, 2, 3, 5, 7, 9, 1, 2, 3, 5, 7, 10, 1, 2, 3, 5, 7, 11, 1, 2, 3, 4, 5, 6, 7, 11, 12, 1, 2, 3, 5, 7, 11, 13, 1, 2, 3, 5, 7, 11, 13, 14, 1, 2, 3, 5, 7, 11, 13, 15, 1, 2, 3, 4, 5, 7, 8, 11, 13, 16]

cp's OEIS Frontend

A229945 Triangle read by rows in which row n lists the union of the primes <= n and the divisors of n.

Table of values

List of values

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

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

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