A374445 - cp's OEIS frontend

A374445 Lexicographically earliest sequence of distinct positive integers such that any pair of consecutive terms are coprime whereas the squarefree kernel of their product is primorial.

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	45
10	16
11	27
12	10
13	21
14	20
15	63
16	40
17	81
18	32
19	75
20	28
21	135
22	56
23	165
24	98
25	225
26	64
27	105
28	22
29	315
30	44
31	525
32	88
33	735
34	128
35	243
36	50
37	147
38	80
39	189
40	100
41	231
42	130
43	693
44	160
45	441
46	110
47	273
48	220
49	567
50	200
51	729
52	70
53	33
54	140
55	99
56	280
57	297
58	350
59	363

[1, 2, 3, 4, 9, 8, 15, 14, 45, 16, 27, 10, 21, 20, 63, 40, 81, 32, 75, 28, 135, 56, 165, 98, 225, 64, 105, 22, 315, 44, 525, 88, 735, 128, 243, 50, 147, 80, 189, 100, 231, 130, 693, 160, 441, 110, 273, 220, 567, 200, 729, 70, 33, 140, 99, 280, 297, 350, 363]

cp's OEIS Frontend

A374445 Lexicographically earliest sequence of distinct positive integers such that any pair of consecutive terms are coprime whereas the squarefree kernel of their product is primorial.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	45
10	16
11	27
12	10
13	21
14	20
15	63
16	40
17	81
18	32
19	75
20	28
21	135
22	56
23	165
24	98
25	225
26	64
27	105
28	22
29	315
30	44
31	525
32	88
33	735
34	128
35	243
36	50
37	147
38	80
39	189
40	100
41	231
42	130
43	693
44	160
45	441
46	110
47	273
48	220
49	567
50	200
51	729
52	70
53	33
54	140
55	99
56	280
57	297
58	350
59	363

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	45
10	16
11	27
12	10
13	21
14	20
15	63
16	40
17	81
18	32
19	75
20	28
21	135
22	56
23	165
24	98
25	225
26	64
27	105
28	22
29	315
30	44
31	525
32	88
33	735
34	128
35	243
36	50
37	147
38	80
39	189
40	100
41	231
42	130
43	693
44	160
45	441
46	110
47	273
48	220
49	567
50	200
51	729
52	70
53	33
54	140
55	99
56	280
57	297
58	350
59	363

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	45
10	16
11	27
12	10
13	21
14	20
15	63
16	40
17	81
18	32
19	75
20	28
21	135
22	56
23	165
24	98
25	225
26	64
27	105
28	22
29	315
30	44
31	525
32	88
33	735
34	128
35	243
36	50
37	147
38	80
39	189
40	100
41	231
42	130
43	693
44	160
45	441
46	110
47	273
48	220
49	567
50	200
51	729
52	70
53	33
54	140
55	99
56	280
57	297
58	350
59	363