A355079 - cp's OEIS frontend

A355079 Irregular triangle read by rows: the first row is 1, and the n-th row (n > 1) lists the factors f of n where n/f is prime (the maximal factors of n.)

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

[1, 1, 1, 2, 1, 2, 3, 1, 4, 3, 2, 5, 1, 4, 6, 1, 2, 7, 3, 5, 8, 1, 6, 9, 1, 4, 10, 3, 7, 2, 11, 1, 8, 12, 5, 2, 13, 9, 4, 14, 1, 6, 10, 15, 1, 16, 3, 11, 2, 17, 5, 7, 12, 18, 1, 2, 19, 3, 13, 8, 20, 1, 6, 14, 21, 1, 4, 22, 9, 15, 2, 23, 1, 16, 24, 7, 10, 25]

cp's OEIS Frontend

A355079 Irregular triangle read by rows: the first row is 1, and the n-th row (n > 1) lists the factors f of n where n/f is prime (the maximal factors of n.)

Table of values

List of values

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

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

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