A026272 - cp's OEIS frontend

A026272 a(n) = smallest k such that k=a(n-k-1) is the only appearance of k so far; if there is no such k, then a(n) = least positive integer that has not yet appeared.

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

[1, 2, 1, 3, 2, 4, 5, 3, 6, 7, 4, 8, 5, 9, 10, 6, 11, 7, 12, 13, 8, 14, 15, 9, 16, 10, 17, 18, 11, 19, 20, 12, 21, 13, 22, 23, 14, 24, 15, 25, 26, 16, 27, 28, 17, 29, 18, 30, 31, 19, 32, 20, 33, 34, 21, 35, 36, 22, 37, 23, 38, 39, 24, 40, 41, 25]

cp's OEIS Frontend

A026272 a(n) = smallest k such that k=a(n-k-1) is the only appearance of k so far; if there is no such k, then a(n) = least positive integer that has not yet appeared.

Table of values

List of values

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

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

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