A079905 - cp's OEIS frontend

A079905 a(1)=1; then a(n) is smallest positive integer which is consistent with sequence being monotonically increasing and satisfying a(a(n)) = 2n+1 for n>1.

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	12
9	13
10	14
11	15
12	17
13	19
14	21
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	31
24	33
25	35
26	37
27	39
28	41
29	43
30	45
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	63
48	65
49	67
50	69
51	71
52	73
53	75
54	77
55	79
56	81
57	83
58	85
59	87
60	89
61	91
62	93
63	95
64	96
65	97
66	98
67	99
68	100
69	101
70	102

[1, 3, 5, 6, 7, 9, 11, 12, 13, 14, 15, 17, 19, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 35, 37, 39, 41, 43, 45, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 96, 97, 98, 99, 100, 101, 102]

cp's OEIS Frontend

A079905 a(1)=1; then a(n) is smallest positive integer which is consistent with sequence being monotonically increasing and satisfying a(a(n)) = 2n+1 for n>1.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	12
9	13
10	14
11	15
12	17
13	19
14	21
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	31
24	33
25	35
26	37
27	39
28	41
29	43
30	45
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	63
48	65
49	67
50	69
51	71
52	73
53	75
54	77
55	79
56	81
57	83
58	85
59	87
60	89
61	91
62	93
63	95
64	96
65	97
66	98
67	99
68	100
69	101
70	102

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	12
9	13
10	14
11	15
12	17
13	19
14	21
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	31
24	33
25	35
26	37
27	39
28	41
29	43
30	45
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	63
48	65
49	67
50	69
51	71
52	73
53	75
54	77
55	79
56	81
57	83
58	85
59	87
60	89
61	91
62	93
63	95
64	96
65	97
66	98
67	99
68	100
69	101
70	102

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	9
7	11
8	12
9	13
10	14
11	15
12	17
13	19
14	21
15	23
16	24
17	25
18	26
19	27
20	28
21	29
22	30
23	31
24	33
25	35
26	37
27	39
28	41
29	43
30	45
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	63
48	65
49	67
50	69
51	71
52	73
53	75
54	77
55	79
56	81
57	83
58	85
59	87
60	89
61	91
62	93
63	95
64	96
65	97
66	98
67	99
68	100
69	101
70	102