A081260 - cp's OEIS frontend

A081260 a(1)=4; for n>1, a(n) is taken to be the third-smallest integer greater than a(n-1) such that the condition "n is a member of the sequence if and only if a(n) is odd" is satisfied.

n	a(n)
1	4
2	10
3	16
4	21
5	26
6	32
7	38
8	44
9	50
10	55
11	60
12	66
13	72
14	78
15	84
16	89
17	94
18	100
19	106
20	112
21	117
22	122
23	128
24	134
25	140
26	145
27	150
28	156
29	162
30	168
31	174
32	179
33	184
34	190
35	196
36	202
37	208
38	213
39	218
40	224
41	230
42	236
43	242
44	247
45	252
46	258
47	264
48	270
49	276
50	281
51	286
52	292
53	298
54	304
55	309
56	314

[4, 10, 16, 21, 26, 32, 38, 44, 50, 55, 60, 66, 72, 78, 84, 89, 94, 100, 106, 112, 117, 122, 128, 134, 140, 145, 150, 156, 162, 168, 174, 179, 184, 190, 196, 202, 208, 213, 218, 224, 230, 236, 242, 247, 252, 258, 264, 270, 276, 281, 286, 292, 298, 304, 309, 314]

cp's OEIS Frontend

A081260 a(1)=4; for n>1, a(n) is taken to be the third-smallest integer greater than a(n-1) such that the condition "n is a member of the sequence if and only if a(n) is odd" is satisfied.

Table of values

List of values

n	a(n)
1	4
2	10
3	16
4	21
5	26
6	32
7	38
8	44
9	50
10	55
11	60
12	66
13	72
14	78
15	84
16	89
17	94
18	100
19	106
20	112
21	117
22	122
23	128
24	134
25	140
26	145
27	150
28	156
29	162
30	168
31	174
32	179
33	184
34	190
35	196
36	202
37	208
38	213
39	218
40	224
41	230
42	236
43	242
44	247
45	252
46	258
47	264
48	270
49	276
50	281
51	286
52	292
53	298
54	304
55	309
56	314

n	a(n)
1	4
2	10
3	16
4	21
5	26
6	32
7	38
8	44
9	50
10	55
11	60
12	66
13	72
14	78
15	84
16	89
17	94
18	100
19	106
20	112
21	117
22	122
23	128
24	134
25	140
26	145
27	150
28	156
29	162
30	168
31	174
32	179
33	184
34	190
35	196
36	202
37	208
38	213
39	218
40	224
41	230
42	236
43	242
44	247
45	252
46	258
47	264
48	270
49	276
50	281
51	286
52	292
53	298
54	304
55	309
56	314

n	a(n)
1	4
2	10
3	16
4	21
5	26
6	32
7	38
8	44
9	50
10	55
11	60
12	66
13	72
14	78
15	84
16	89
17	94
18	100
19	106
20	112
21	117
22	122
23	128
24	134
25	140
26	145
27	150
28	156
29	162
30	168
31	174
32	179
33	184
34	190
35	196
36	202
37	208
38	213
39	218
40	224
41	230
42	236
43	242
44	247
45	252
46	258
47	264
48	270
49	276
50	281
51	286
52	292
53	298
54	304
55	309
56	314