A381398 - cp's OEIS frontend

A381398 Irregular triangle read by rows, where row n lists the elements of the set of bases and exponents (including exponents = 1) in the prime factorization of n.

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

[1, 2, 1, 3, 2, 1, 5, 1, 2, 3, 1, 7, 2, 3, 2, 3, 1, 2, 5, 1, 11, 1, 2, 3, 1, 13, 1, 2, 7, 1, 3, 5, 2, 4, 1, 17, 1, 2, 3, 1, 19, 1, 2, 5, 1, 3, 7, 1, 2, 11, 1, 23, 1, 2, 3, 2, 5, 1, 2, 13, 3, 1, 2, 7, 1, 29, 1, 2, 3, 5, 1, 31, 2, 5, 1, 3, 11, 1, 2, 17, 1, 5, 7, 2, 3]

cp's OEIS Frontend

A381398 Irregular triangle read by rows, where row n lists the elements of the set of bases and exponents (including exponents = 1) in the prime factorization of n.

Table of values

List of values

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

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

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