A080460 - cp's OEIS frontend

A080460 a(1) = 2; for n > 1, a(n) = a(n-1) if n is already in the sequence, a(n) = a(n-1) + 4 otherwise.

n	a(n)
1	2
2	2
3	6
4	10
5	14
6	14
7	18
8	22
9	26
10	26
11	30
12	34
13	38
14	38
15	42
16	46
17	50
18	50
19	54
20	58
21	62
22	62
23	66
24	70
25	74
26	74
27	78
28	82
29	86
30	86
31	90
32	94
33	98
34	98
35	102
36	106
37	110
38	110
39	114
40	118
41	122
42	122
43	126
44	130
45	134
46	134
47	138
48	142
49	146
50	146
51	150
52	154
53	158
54	158
55	162
56	166
57	170
58	170

[2, 2, 6, 10, 14, 14, 18, 22, 26, 26, 30, 34, 38, 38, 42, 46, 50, 50, 54, 58, 62, 62, 66, 70, 74, 74, 78, 82, 86, 86, 90, 94, 98, 98, 102, 106, 110, 110, 114, 118, 122, 122, 126, 130, 134, 134, 138, 142, 146, 146, 150, 154, 158, 158, 162, 166, 170, 170]

cp's OEIS Frontend

A080460 a(1) = 2; for n > 1, a(n) = a(n-1) if n is already in the sequence, a(n) = a(n-1) + 4 otherwise.

Table of values

List of values

n	a(n)
1	2
2	2
3	6
4	10
5	14
6	14
7	18
8	22
9	26
10	26
11	30
12	34
13	38
14	38
15	42
16	46
17	50
18	50
19	54
20	58
21	62
22	62
23	66
24	70
25	74
26	74
27	78
28	82
29	86
30	86
31	90
32	94
33	98
34	98
35	102
36	106
37	110
38	110
39	114
40	118
41	122
42	122
43	126
44	130
45	134
46	134
47	138
48	142
49	146
50	146
51	150
52	154
53	158
54	158
55	162
56	166
57	170
58	170

n	a(n)
1	2
2	2
3	6
4	10
5	14
6	14
7	18
8	22
9	26
10	26
11	30
12	34
13	38
14	38
15	42
16	46
17	50
18	50
19	54
20	58
21	62
22	62
23	66
24	70
25	74
26	74
27	78
28	82
29	86
30	86
31	90
32	94
33	98
34	98
35	102
36	106
37	110
38	110
39	114
40	118
41	122
42	122
43	126
44	130
45	134
46	134
47	138
48	142
49	146
50	146
51	150
52	154
53	158
54	158
55	162
56	166
57	170
58	170

n	a(n)
1	2
2	2
3	6
4	10
5	14
6	14
7	18
8	22
9	26
10	26
11	30
12	34
13	38
14	38
15	42
16	46
17	50
18	50
19	54
20	58
21	62
22	62
23	66
24	70
25	74
26	74
27	78
28	82
29	86
30	86
31	90
32	94
33	98
34	98
35	102
36	106
37	110
38	110
39	114
40	118
41	122
42	122
43	126
44	130
45	134
46	134
47	138
48	142
49	146
50	146
51	150
52	154
53	158
54	158
55	162
56	166
57	170
58	170