A086398 - cp's OEIS frontend

A086398 a(1)=1; a(n)=a(n-1)+2 if n is in the sequence; a(n)=a(n-1)+2 if n and (n-1) are not in the sequence; a(n)=a(n-1)+4 if n is not in the sequence but (n-1) is in the sequence.

n	a(n)
1	1
2	5
3	7
4	9
5	11
6	15
7	17
8	21
9	23
10	27
11	29
12	33
13	35
14	37
15	39
16	43
17	45
18	49
19	51
20	53
21	55
22	59
23	61
24	65
25	67
26	69
27	71
28	75
29	77
30	81
31	83
32	85
33	87
34	91
35	93
36	97
37	99
38	103
39	105
40	109
41	111
42	113
43	115
44	119
45	121
46	125
47	127
48	129
49	131
50	135
51	137
52	141
53	143
54	147
55	149
56	153
57	155
58	157
59	159
60	163
61	165
62	169

[1, 5, 7, 9, 11, 15, 17, 21, 23, 27, 29, 33, 35, 37, 39, 43, 45, 49, 51, 53, 55, 59, 61, 65, 67, 69, 71, 75, 77, 81, 83, 85, 87, 91, 93, 97, 99, 103, 105, 109, 111, 113, 115, 119, 121, 125, 127, 129, 131, 135, 137, 141, 143, 147, 149, 153, 155, 157, 159, 163, 165, 169]

cp's OEIS Frontend

A086398 a(1)=1; a(n)=a(n-1)+2 if n is in the sequence; a(n)=a(n-1)+2 if n and (n-1) are not in the sequence; a(n)=a(n-1)+4 if n is not in the sequence but (n-1) is in the sequence.

Table of values

List of values

n	a(n)
1	1
2	5
3	7
4	9
5	11
6	15
7	17
8	21
9	23
10	27
11	29
12	33
13	35
14	37
15	39
16	43
17	45
18	49
19	51
20	53
21	55
22	59
23	61
24	65
25	67
26	69
27	71
28	75
29	77
30	81
31	83
32	85
33	87
34	91
35	93
36	97
37	99
38	103
39	105
40	109
41	111
42	113
43	115
44	119
45	121
46	125
47	127
48	129
49	131
50	135
51	137
52	141
53	143
54	147
55	149
56	153
57	155
58	157
59	159
60	163
61	165
62	169

n	a(n)
1	1
2	5
3	7
4	9
5	11
6	15
7	17
8	21
9	23
10	27
11	29
12	33
13	35
14	37
15	39
16	43
17	45
18	49
19	51
20	53
21	55
22	59
23	61
24	65
25	67
26	69
27	71
28	75
29	77
30	81
31	83
32	85
33	87
34	91
35	93
36	97
37	99
38	103
39	105
40	109
41	111
42	113
43	115
44	119
45	121
46	125
47	127
48	129
49	131
50	135
51	137
52	141
53	143
54	147
55	149
56	153
57	155
58	157
59	159
60	163
61	165
62	169

n	a(n)
1	1
2	5
3	7
4	9
5	11
6	15
7	17
8	21
9	23
10	27
11	29
12	33
13	35
14	37
15	39
16	43
17	45
18	49
19	51
20	53
21	55
22	59
23	61
24	65
25	67
26	69
27	71
28	75
29	77
30	81
31	83
32	85
33	87
34	91
35	93
36	97
37	99
38	103
39	105
40	109
41	111
42	113
43	115
44	119
45	121
46	125
47	127
48	129
49	131
50	135
51	137
52	141
53	143
54	147
55	149
56	153
57	155
58	157
59	159
60	163
61	165
62	169