A077661 - cp's OEIS frontend

A077661 Triangle read by rows in which the n-th row contains n smallest numbers not coprime to n; except first row = {1}.

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	9
7	2
8	4
9	6
10	8
11	5
12	10
13	15
14	20
15	25
16	2
17	3
18	4
19	6
20	8
21	9
22	7
23	14
24	21
25	28
26	35
27	42
28	49
29	2
30	4
31	6
32	8
33	10
34	12
35	14
36	16
37	3
38	6
39	9
40	12
41	15
42	18
43	21
44	24
45	27
46	2
47	4
48	5
49	6
50	8
51	10
52	12
53	14
54	15
55	16
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	121
67	2
68	3
69	4
70	6
71	8
72	9
73	10
74	12
75	14
76	15
77	16
78	18

[1, 2, 4, 3, 6, 9, 2, 4, 6, 8, 5, 10, 15, 20, 25, 2, 3, 4, 6, 8, 9, 7, 14, 21, 28, 35, 42, 49, 2, 4, 6, 8, 10, 12, 14, 16, 3, 6, 9, 12, 15, 18, 21, 24, 27, 2, 4, 5, 6, 8, 10, 12, 14, 15, 16, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18]

cp's OEIS Frontend

A077661 Triangle read by rows in which the n-th row contains n smallest numbers not coprime to n; except first row = {1}.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	9
7	2
8	4
9	6
10	8
11	5
12	10
13	15
14	20
15	25
16	2
17	3
18	4
19	6
20	8
21	9
22	7
23	14
24	21
25	28
26	35
27	42
28	49
29	2
30	4
31	6
32	8
33	10
34	12
35	14
36	16
37	3
38	6
39	9
40	12
41	15
42	18
43	21
44	24
45	27
46	2
47	4
48	5
49	6
50	8
51	10
52	12
53	14
54	15
55	16
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	121
67	2
68	3
69	4
70	6
71	8
72	9
73	10
74	12
75	14
76	15
77	16
78	18

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	9
7	2
8	4
9	6
10	8
11	5
12	10
13	15
14	20
15	25
16	2
17	3
18	4
19	6
20	8
21	9
22	7
23	14
24	21
25	28
26	35
27	42
28	49
29	2
30	4
31	6
32	8
33	10
34	12
35	14
36	16
37	3
38	6
39	9
40	12
41	15
42	18
43	21
44	24
45	27
46	2
47	4
48	5
49	6
50	8
51	10
52	12
53	14
54	15
55	16
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	121
67	2
68	3
69	4
70	6
71	8
72	9
73	10
74	12
75	14
76	15
77	16
78	18

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	9
7	2
8	4
9	6
10	8
11	5
12	10
13	15
14	20
15	25
16	2
17	3
18	4
19	6
20	8
21	9
22	7
23	14
24	21
25	28
26	35
27	42
28	49
29	2
30	4
31	6
32	8
33	10
34	12
35	14
36	16
37	3
38	6
39	9
40	12
41	15
42	18
43	21
44	24
45	27
46	2
47	4
48	5
49	6
50	8
51	10
52	12
53	14
54	15
55	16
56	11
57	22
58	33
59	44
60	55
61	66
62	77
63	88
64	99
65	110
66	121
67	2
68	3
69	4
70	6
71	8
72	9
73	10
74	12
75	14
76	15
77	16
78	18