A348390 - cp's OEIS frontend

A348390 Irregular triangle read by rows: for n >= 2 the row members a(n, m) give the proper divisors of k, followed by the multiples of k larger than k and not exceeding n, for k = 1, 2, ..., n.

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

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

cp's OEIS Frontend

A348390 Irregular triangle read by rows: for n >= 2 the row members a(n, m) give the proper divisors of k, followed by the multiples of k larger than k and not exceeding n, for k = 1, 2, ..., n.

Table of values

List of values

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

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

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