A356988 - cp's OEIS frontend

A356988 a(n) = n - a^[2](n - a^[3](n-1)) with a(1) = 1, where a^[2](n) = a(a(n)) and a^[3](n) = a(a(a(n))).

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	5
9	6
10	7
11	8
12	8
13	8
14	9
15	10
16	11
17	12
18	13
19	13
20	13
21	13
22	14
23	15
24	16
25	17
26	18
27	19
28	20
29	21
30	21
31	21
32	21
33	21
34	21
35	22
36	23
37	24
38	25
39	26
40	27
41	28
42	29
43	30
44	31
45	32
46	33
47	34
48	34
49	34
50	34
51	34
52	34
53	34
54	34
55	34
56	35
57	36
58	37
59	38
60	39
61	40
62	41
63	42
64	43
65	44
66	45
67	46
68	47
69	48
70	49
71	50
72	51
73	52
74	53
75	54
76	55
77	55
78	55
79	55
80	55
81	55

[1, 1, 2, 3, 3, 4, 5, 5, 6, 7, 8, 8, 8, 9, 10, 11, 12, 13, 13, 13, 13, 14, 15, 16, 17, 18, 19, 20, 21, 21, 21, 21, 21, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 34, 34, 34, 34, 34, 34, 34, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 55, 55, 55, 55, 55]

cp's OEIS Frontend

A356988 a(n) = n - a^[2](n - a^[3](n-1)) with a(1) = 1, where a^[2](n) = a(a(n)) and a^[3](n) = a(a(a(n))).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	5
9	6
10	7
11	8
12	8
13	8
14	9
15	10
16	11
17	12
18	13
19	13
20	13
21	13
22	14
23	15
24	16
25	17
26	18
27	19
28	20
29	21
30	21
31	21
32	21
33	21
34	21
35	22
36	23
37	24
38	25
39	26
40	27
41	28
42	29
43	30
44	31
45	32
46	33
47	34
48	34
49	34
50	34
51	34
52	34
53	34
54	34
55	34
56	35
57	36
58	37
59	38
60	39
61	40
62	41
63	42
64	43
65	44
66	45
67	46
68	47
69	48
70	49
71	50
72	51
73	52
74	53
75	54
76	55
77	55
78	55
79	55
80	55
81	55

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	5
9	6
10	7
11	8
12	8
13	8
14	9
15	10
16	11
17	12
18	13
19	13
20	13
21	13
22	14
23	15
24	16
25	17
26	18
27	19
28	20
29	21
30	21
31	21
32	21
33	21
34	21
35	22
36	23
37	24
38	25
39	26
40	27
41	28
42	29
43	30
44	31
45	32
46	33
47	34
48	34
49	34
50	34
51	34
52	34
53	34
54	34
55	34
56	35
57	36
58	37
59	38
60	39
61	40
62	41
63	42
64	43
65	44
66	45
67	46
68	47
69	48
70	49
71	50
72	51
73	52
74	53
75	54
76	55
77	55
78	55
79	55
80	55
81	55

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	5
9	6
10	7
11	8
12	8
13	8
14	9
15	10
16	11
17	12
18	13
19	13
20	13
21	13
22	14
23	15
24	16
25	17
26	18
27	19
28	20
29	21
30	21
31	21
32	21
33	21
34	21
35	22
36	23
37	24
38	25
39	26
40	27
41	28
42	29
43	30
44	31
45	32
46	33
47	34
48	34
49	34
50	34
51	34
52	34
53	34
54	34
55	34
56	35
57	36
58	37
59	38
60	39
61	40
62	41
63	42
64	43
65	44
66	45
67	46
68	47
69	48
70	49
71	50
72	51
73	52
74	53
75	54
76	55
77	55
78	55
79	55
80	55
81	55