A080653 - cp's OEIS frontend

A080653 a(1) = 2; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) such that the condition "a(a(n)) is always even" is satisfied.

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	11
8	12
9	13
10	14
11	16
12	18
13	20
14	22
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	32
24	34
25	36
26	38
27	40
28	42
29	44
30	46
31	47
32	48
33	49
34	50
35	51
36	52
37	53
38	54
39	55
40	56
41	57
42	58
43	59
44	60
45	61
46	62
47	64
48	66
49	68
50	70
51	72
52	74
53	76
54	78
55	80
56	82
57	84
58	86
59	88
60	90
61	92
62	94
63	95
64	96
65	97

[2, 4, 5, 6, 8, 10, 11, 12, 13, 14, 16, 18, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 34, 36, 38, 40, 42, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 95, 96, 97]

cp's OEIS Frontend

A080653 a(1) = 2; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) such that the condition "a(a(n)) is always even" is satisfied.

Table of values

List of values

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	11
8	12
9	13
10	14
11	16
12	18
13	20
14	22
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	32
24	34
25	36
26	38
27	40
28	42
29	44
30	46
31	47
32	48
33	49
34	50
35	51
36	52
37	53
38	54
39	55
40	56
41	57
42	58
43	59
44	60
45	61
46	62
47	64
48	66
49	68
50	70
51	72
52	74
53	76
54	78
55	80
56	82
57	84
58	86
59	88
60	90
61	92
62	94
63	95
64	96
65	97

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	11
8	12
9	13
10	14
11	16
12	18
13	20
14	22
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	32
24	34
25	36
26	38
27	40
28	42
29	44
30	46
31	47
32	48
33	49
34	50
35	51
36	52
37	53
38	54
39	55
40	56
41	57
42	58
43	59
44	60
45	61
46	62
47	64
48	66
49	68
50	70
51	72
52	74
53	76
54	78
55	80
56	82
57	84
58	86
59	88
60	90
61	92
62	94
63	95
64	96
65	97

n	a(n)
1	2
2	4
3	5
4	6
5	8
6	10
7	11
8	12
9	13
10	14
11	16
12	18
13	20
14	22
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	32
24	34
25	36
26	38
27	40
28	42
29	44
30	46
31	47
32	48
33	49
34	50
35	51
36	52
37	53
38	54
39	55
40	56
41	57
42	58
43	59
44	60
45	61
46	62
47	64
48	66
49	68
50	70
51	72
52	74
53	76
54	78
55	80
56	82
57	84
58	86
59	88
60	90
61	92
62	94
63	95
64	96
65	97