A359256 - cp's OEIS frontend

A359256 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number which has not appeared such that all the distinct prime factors of a(n-1) + a(n) are factors of a(n).

n	a(n)
1	1
2	2
3	6
4	3
5	24
6	8
7	56
8	42
9	7
10	336
11	48
12	16
13	112
14	84
15	12
16	4
17	28
18	21
19	60
20	15
21	10
22	22
23	66
24	30
25	18
26	9
27	72
28	36
29	45
30	80
31	20
32	5
33	120
34	40
35	85
36	204
37	39
38	78
39	26
40	38
41	90
42	35
43	14
44	50
45	75
46	150
47	93
48	186
49	57
50	114
51	102
52	34
53	94
54	162
55	54
56	27
57	216
58	108
59	135
60	240
61	144
62	99
63	198
64	44
65	77
66	266
67	95
68	380
69	132
70	110
71	11

[1, 2, 6, 3, 24, 8, 56, 42, 7, 336, 48, 16, 112, 84, 12, 4, 28, 21, 60, 15, 10, 22, 66, 30, 18, 9, 72, 36, 45, 80, 20, 5, 120, 40, 85, 204, 39, 78, 26, 38, 90, 35, 14, 50, 75, 150, 93, 186, 57, 114, 102, 34, 94, 162, 54, 27, 216, 108, 135, 240, 144, 99, 198, 44, 77, 266, 95, 380, 132, 110, 11]

cp's OEIS Frontend

A359256 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number which has not appeared such that all the distinct prime factors of a(n-1) + a(n) are factors of a(n).

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	3
5	24
6	8
7	56
8	42
9	7
10	336
11	48
12	16
13	112
14	84
15	12
16	4
17	28
18	21
19	60
20	15
21	10
22	22
23	66
24	30
25	18
26	9
27	72
28	36
29	45
30	80
31	20
32	5
33	120
34	40
35	85
36	204
37	39
38	78
39	26
40	38
41	90
42	35
43	14
44	50
45	75
46	150
47	93
48	186
49	57
50	114
51	102
52	34
53	94
54	162
55	54
56	27
57	216
58	108
59	135
60	240
61	144
62	99
63	198
64	44
65	77
66	266
67	95
68	380
69	132
70	110
71	11

n	a(n)
1	1
2	2
3	6
4	3
5	24
6	8
7	56
8	42
9	7
10	336
11	48
12	16
13	112
14	84
15	12
16	4
17	28
18	21
19	60
20	15
21	10
22	22
23	66
24	30
25	18
26	9
27	72
28	36
29	45
30	80
31	20
32	5
33	120
34	40
35	85
36	204
37	39
38	78
39	26
40	38
41	90
42	35
43	14
44	50
45	75
46	150
47	93
48	186
49	57
50	114
51	102
52	34
53	94
54	162
55	54
56	27
57	216
58	108
59	135
60	240
61	144
62	99
63	198
64	44
65	77
66	266
67	95
68	380
69	132
70	110
71	11

n	a(n)
1	1
2	2
3	6
4	3
5	24
6	8
7	56
8	42
9	7
10	336
11	48
12	16
13	112
14	84
15	12
16	4
17	28
18	21
19	60
20	15
21	10
22	22
23	66
24	30
25	18
26	9
27	72
28	36
29	45
30	80
31	20
32	5
33	120
34	40
35	85
36	204
37	39
38	78
39	26
40	38
41	90
42	35
43	14
44	50
45	75
46	150
47	93
48	186
49	57
50	114
51	102
52	34
53	94
54	162
55	54
56	27
57	216
58	108
59	135
60	240
61	144
62	99
63	198
64	44
65	77
66	266
67	95
68	380
69	132
70	110
71	11