A272618 - cp's OEIS frontend

A272618 Irregular array read by rows: n-th row contains (in ascending order) the nondivisors 1 <= k < n such that all the prime divisors p of k also divide n.

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

[0, 0, 0, 0, 0, 4, 0, 0, 0, 4, 8, 0, 8, 9, 0, 4, 8, 9, 0, 0, 4, 8, 12, 16, 0, 8, 16, 9, 4, 8, 16, 0, 9, 16, 18, 0, 4, 8, 16, 0, 8, 16, 0, 4, 8, 9, 12, 16, 18, 20, 24, 25, 27, 0, 0, 9, 27, 4, 8, 16, 32, 25, 8, 16, 24, 27, 32, 0, 4, 8, 16, 32, 9, 27, 16, 25, 32, 0, 4, 8, 9, 12, 16, 18, 24, 27, 28, 32]

cp's OEIS Frontend

A272618 Irregular array read by rows: n-th row contains (in ascending order) the nondivisors 1 <= k < n such that all the prime divisors p of k also divide n.

Table of values

List of values

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

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

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