A379746 - cp's OEIS frontend

A379746 a(1)=1. For n>1 if a(n-1)=A002110(k), a(n)=prime(k+1). Otherwise a(n) is the smallest novel number whose prime factors have already occurred as previous terms.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	8
8	9
9	10
10	12
11	15
12	16
13	18
14	20
15	24
16	25
17	27
18	30
19	7
20	14
21	21
22	28
23	32
24	35
25	36
26	40
27	42
28	45
29	48
30	49
31	50
32	54
33	56
34	60
35	63
36	64
37	70
38	72
39	75
40	80
41	81
42	84
43	90
44	96
45	98
46	100
47	105
48	108
49	112
50	120
51	125
52	126
53	128
54	135
55	140
56	144
57	147
58	150
59	160
60	162
61	168
62	175
63	180

[1, 2, 3, 4, 6, 5, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 27, 30, 7, 14, 21, 28, 32, 35, 36, 40, 42, 45, 48, 49, 50, 54, 56, 60, 63, 64, 70, 72, 75, 80, 81, 84, 90, 96, 98, 100, 105, 108, 112, 120, 125, 126, 128, 135, 140, 144, 147, 150, 160, 162, 168, 175, 180]

cp's OEIS Frontend

A379746 a(1)=1. For n>1 if a(n-1)=A002110(k), a(n)=prime(k+1). Otherwise a(n) is the smallest novel number whose prime factors have already occurred as previous terms.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	8
8	9
9	10
10	12
11	15
12	16
13	18
14	20
15	24
16	25
17	27
18	30
19	7
20	14
21	21
22	28
23	32
24	35
25	36
26	40
27	42
28	45
29	48
30	49
31	50
32	54
33	56
34	60
35	63
36	64
37	70
38	72
39	75
40	80
41	81
42	84
43	90
44	96
45	98
46	100
47	105
48	108
49	112
50	120
51	125
52	126
53	128
54	135
55	140
56	144
57	147
58	150
59	160
60	162
61	168
62	175
63	180

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	8
8	9
9	10
10	12
11	15
12	16
13	18
14	20
15	24
16	25
17	27
18	30
19	7
20	14
21	21
22	28
23	32
24	35
25	36
26	40
27	42
28	45
29	48
30	49
31	50
32	54
33	56
34	60
35	63
36	64
37	70
38	72
39	75
40	80
41	81
42	84
43	90
44	96
45	98
46	100
47	105
48	108
49	112
50	120
51	125
52	126
53	128
54	135
55	140
56	144
57	147
58	150
59	160
60	162
61	168
62	175
63	180

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	8
8	9
9	10
10	12
11	15
12	16
13	18
14	20
15	24
16	25
17	27
18	30
19	7
20	14
21	21
22	28
23	32
24	35
25	36
26	40
27	42
28	45
29	48
30	49
31	50
32	54
33	56
34	60
35	63
36	64
37	70
38	72
39	75
40	80
41	81
42	84
43	90
44	96
45	98
46	100
47	105
48	108
49	112
50	120
51	125
52	126
53	128
54	135
55	140
56	144
57	147
58	150
59	160
60	162
61	168
62	175
63	180