A381139 - cp's OEIS frontend

A381139 a(1) = 1, a(2) = 2. Let j = a(n-1) and let d = A160995(j) be the smallest non-divisor of j which shares a prime factor with j. Then for n > 2 a(n) is the smallest multiple of d which is not yet in the sequence.

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	12
7	16
8	18
9	20
10	24
11	9
12	30
13	28
14	36
15	32
16	42
17	40
18	48
19	27
20	54
21	44
22	60
23	56
24	66
25	52
26	72
27	10
28	64
29	78
30	68
31	84
32	80
33	90
34	76
35	96
36	45
37	102
38	88
39	108
40	104
41	114
42	92
43	120
44	63
45	126
46	100
47	132
48	112
49	138
50	116
51	144
52	50
53	124
54	150
55	128
56	156
57	136
58	162
59	140
60	168
61	81
62	174

[1, 2, 4, 6, 8, 12, 16, 18, 20, 24, 9, 30, 28, 36, 32, 42, 40, 48, 27, 54, 44, 60, 56, 66, 52, 72, 10, 64, 78, 68, 84, 80, 90, 76, 96, 45, 102, 88, 108, 104, 114, 92, 120, 63, 126, 100, 132, 112, 138, 116, 144, 50, 124, 150, 128, 156, 136, 162, 140, 168, 81, 174]

cp's OEIS Frontend

A381139 a(1) = 1, a(2) = 2. Let j = a(n-1) and let d = A160995(j) be the smallest non-divisor of j which shares a prime factor with j. Then for n > 2 a(n) is the smallest multiple of d which is not yet in the sequence.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	12
7	16
8	18
9	20
10	24
11	9
12	30
13	28
14	36
15	32
16	42
17	40
18	48
19	27
20	54
21	44
22	60
23	56
24	66
25	52
26	72
27	10
28	64
29	78
30	68
31	84
32	80
33	90
34	76
35	96
36	45
37	102
38	88
39	108
40	104
41	114
42	92
43	120
44	63
45	126
46	100
47	132
48	112
49	138
50	116
51	144
52	50
53	124
54	150
55	128
56	156
57	136
58	162
59	140
60	168
61	81
62	174

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	12
7	16
8	18
9	20
10	24
11	9
12	30
13	28
14	36
15	32
16	42
17	40
18	48
19	27
20	54
21	44
22	60
23	56
24	66
25	52
26	72
27	10
28	64
29	78
30	68
31	84
32	80
33	90
34	76
35	96
36	45
37	102
38	88
39	108
40	104
41	114
42	92
43	120
44	63
45	126
46	100
47	132
48	112
49	138
50	116
51	144
52	50
53	124
54	150
55	128
56	156
57	136
58	162
59	140
60	168
61	81
62	174

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	12
7	16
8	18
9	20
10	24
11	9
12	30
13	28
14	36
15	32
16	42
17	40
18	48
19	27
20	54
21	44
22	60
23	56
24	66
25	52
26	72
27	10
28	64
29	78
30	68
31	84
32	80
33	90
34	76
35	96
36	45
37	102
38	88
39	108
40	104
41	114
42	92
43	120
44	63
45	126
46	100
47	132
48	112
49	138
50	116
51	144
52	50
53	124
54	150
55	128
56	156
57	136
58	162
59	140
60	168
61	81
62	174