A069904 - cp's OEIS frontend

A069904 Number of prime factors of n-th triangular number (with multiplicity).

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

[0, 1, 2, 2, 2, 2, 3, 4, 3, 2, 3, 3, 2, 3, 5, 4, 3, 3, 3, 4, 3, 2, 4, 5, 3, 4, 5, 3, 3, 3, 5, 6, 3, 3, 5, 4, 2, 3, 5, 4, 3, 3, 3, 5, 4, 2, 5, 6, 4, 4, 4, 3, 4, 5, 5, 5, 3, 2, 4, 4, 2, 4, 8, 7, 4, 3, 3, 4, 4, 3, 5, 5, 2, 4, 5, 4, 4, 3, 5, 8, 5, 2, 4, 5, 3, 3, 5, 4, 4, 5]

cp's OEIS Frontend

A069904 Number of prime factors of n-th triangular number (with multiplicity).

Table of values

List of values

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

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

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