A359557 - cp's OEIS frontend

A359557 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-2) + a(n-1) are factors of a(n).

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	12
10	20
11	14
12	34
13	18
14	26
15	22
16	24
17	46
18	70
19	58
20	16
21	74
22	30
23	52
24	82
25	134
26	36
27	170
28	206
29	94
30	60
31	154
32	214
33	92
34	102
35	194
36	148
37	114
38	262
39	188
40	90
41	278
42	138
43	78
44	42
45	120
46	48
47	84
48	66
49	150
50	54
51	204
52	258
53	462
54	180
55	642
56	822
57	366
58	132
59	498
60	210
61	354
62	282
63	318
64	240
65	186
66	426
67	306

[1, 2, 3, 5, 4, 6, 10, 8, 12, 20, 14, 34, 18, 26, 22, 24, 46, 70, 58, 16, 74, 30, 52, 82, 134, 36, 170, 206, 94, 60, 154, 214, 92, 102, 194, 148, 114, 262, 188, 90, 278, 138, 78, 42, 120, 48, 84, 66, 150, 54, 204, 258, 462, 180, 642, 822, 366, 132, 498, 210, 354, 282, 318, 240, 186, 426, 306]

cp's OEIS Frontend

A359557 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-2) + a(n-1) are factors of a(n).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	12
10	20
11	14
12	34
13	18
14	26
15	22
16	24
17	46
18	70
19	58
20	16
21	74
22	30
23	52
24	82
25	134
26	36
27	170
28	206
29	94
30	60
31	154
32	214
33	92
34	102
35	194
36	148
37	114
38	262
39	188
40	90
41	278
42	138
43	78
44	42
45	120
46	48
47	84
48	66
49	150
50	54
51	204
52	258
53	462
54	180
55	642
56	822
57	366
58	132
59	498
60	210
61	354
62	282
63	318
64	240
65	186
66	426
67	306

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	12
10	20
11	14
12	34
13	18
14	26
15	22
16	24
17	46
18	70
19	58
20	16
21	74
22	30
23	52
24	82
25	134
26	36
27	170
28	206
29	94
30	60
31	154
32	214
33	92
34	102
35	194
36	148
37	114
38	262
39	188
40	90
41	278
42	138
43	78
44	42
45	120
46	48
47	84
48	66
49	150
50	54
51	204
52	258
53	462
54	180
55	642
56	822
57	366
58	132
59	498
60	210
61	354
62	282
63	318
64	240
65	186
66	426
67	306

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	6
7	10
8	8
9	12
10	20
11	14
12	34
13	18
14	26
15	22
16	24
17	46
18	70
19	58
20	16
21	74
22	30
23	52
24	82
25	134
26	36
27	170
28	206
29	94
30	60
31	154
32	214
33	92
34	102
35	194
36	148
37	114
38	262
39	188
40	90
41	278
42	138
43	78
44	42
45	120
46	48
47	84
48	66
49	150
50	54
51	204
52	258
53	462
54	180
55	642
56	822
57	366
58	132
59	498
60	210
61	354
62	282
63	318
64	240
65	186
66	426
67	306