A272619 - cp's OEIS frontend

A272619 Irregular array read by rows: n-th row contains (in ascending order) the numbers 1 <= k < n such that at least one prime divisor p of k also divides n and at least one prime divisor q of k is coprime to n.

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

[0, 0, 0, 0, 0, 0, 0, 6, 6, 6, 0, 10, 0, 6, 10, 12, 6, 10, 12, 6, 10, 12, 14, 0, 10, 14, 15, 0, 6, 12, 14, 15, 18, 6, 12, 14, 15, 18, 6, 10, 12, 14, 18, 20, 0, 10, 14, 15, 20, 21, 22, 10, 15, 20, 6, 10, 12, 14, 18, 20, 22, 24, 6, 12, 15, 18, 21, 24, 6, 10, 12, 18, 20, 21, 22, 24, 26, 0, 14, 21, 22]

cp's OEIS Frontend

A272619 Irregular array read by rows: n-th row contains (in ascending order) the numbers 1 <= k < n such that at least one prime divisor p of k also divides n and at least one prime divisor q of k is coprime to n.

Table of values

List of values

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

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

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