A120499 - cp's OEIS frontend

A120499 Irregular triangle read by rows in which the n-th row consists of the positive integers which are <= n and divisible by exactly one prime dividing n (but are coprime to every other prime dividing n). (a(1) = 1).

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

[1, 2, 3, 2, 4, 5, 2, 3, 4, 7, 2, 4, 6, 8, 3, 6, 9, 2, 4, 5, 6, 8, 11, 2, 3, 4, 8, 9, 10, 13, 2, 4, 6, 7, 8, 10, 12, 3, 5, 6, 9, 10, 12, 2, 4, 6, 8, 10, 12, 14, 16, 17, 2, 3, 4, 8, 9, 10, 14, 15, 16, 19, 2, 4, 5, 6, 8, 12, 14, 15, 16, 18, 3, 6, 7, 9, 12, 14, 15, 18, 2, 4, 6, 8, 10, 11, 12, 14, 16, 18]

cp's OEIS Frontend

A120499 Irregular triangle read by rows in which the n-th row consists of the positive integers which are <= n and divisible by exactly one prime dividing n (but are coprime to every other prime dividing n). (a(1) = 1).

Table of values

List of values

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

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

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