A356990 - cp's OEIS frontend

A356990 a(n) = n - a^[4](n - a^[5](n-1)) with a(1) = 1, where a^[4](n) = a(a(a(a(n)))) and a^[5](n) = a(a(a(a(a(n))))).

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	5
8	6
9	7
10	7
11	8
12	9
13	10
14	10
15	11
16	12
17	13
18	14
19	14
20	15
21	16
22	17
23	18
24	19
25	19
26	19
27	20
28	21
29	22
30	23
31	24
32	25
33	26
34	26
35	26
36	26
37	27
38	28
39	29
40	30
41	31
42	32
43	33
44	34
45	35
46	36
47	36
48	36
49	36
50	36
51	37
52	38
53	39
54	40
55	41
56	42
57	43
58	44
59	45
60	46
61	47
62	48
63	49
64	50
65	50
66	50
67	50
68	50
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57
77	58
78	59
79	60
80	61
81	62
82	63
83	64
84	65
85	66
86	67
87	68
88	69
89	69
90	69
91	69
92	69
93	69
94	69
95	69
96	70
97	71

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

cp's OEIS Frontend

A356990 a(n) = n - a^[4](n - a^[5](n-1)) with a(1) = 1, where a^[4](n) = a(a(a(a(n)))) and a^[5](n) = a(a(a(a(a(n))))).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	5
8	6
9	7
10	7
11	8
12	9
13	10
14	10
15	11
16	12
17	13
18	14
19	14
20	15
21	16
22	17
23	18
24	19
25	19
26	19
27	20
28	21
29	22
30	23
31	24
32	25
33	26
34	26
35	26
36	26
37	27
38	28
39	29
40	30
41	31
42	32
43	33
44	34
45	35
46	36
47	36
48	36
49	36
50	36
51	37
52	38
53	39
54	40
55	41
56	42
57	43
58	44
59	45
60	46
61	47
62	48
63	49
64	50
65	50
66	50
67	50
68	50
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57
77	58
78	59
79	60
80	61
81	62
82	63
83	64
84	65
85	66
86	67
87	68
88	69
89	69
90	69
91	69
92	69
93	69
94	69
95	69
96	70
97	71

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	5
8	6
9	7
10	7
11	8
12	9
13	10
14	10
15	11
16	12
17	13
18	14
19	14
20	15
21	16
22	17
23	18
24	19
25	19
26	19
27	20
28	21
29	22
30	23
31	24
32	25
33	26
34	26
35	26
36	26
37	27
38	28
39	29
40	30
41	31
42	32
43	33
44	34
45	35
46	36
47	36
48	36
49	36
50	36
51	37
52	38
53	39
54	40
55	41
56	42
57	43
58	44
59	45
60	46
61	47
62	48
63	49
64	50
65	50
66	50
67	50
68	50
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57
77	58
78	59
79	60
80	61
81	62
82	63
83	64
84	65
85	66
86	67
87	68
88	69
89	69
90	69
91	69
92	69
93	69
94	69
95	69
96	70
97	71

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	5
7	5
8	6
9	7
10	7
11	8
12	9
13	10
14	10
15	11
16	12
17	13
18	14
19	14
20	15
21	16
22	17
23	18
24	19
25	19
26	19
27	20
28	21
29	22
30	23
31	24
32	25
33	26
34	26
35	26
36	26
37	27
38	28
39	29
40	30
41	31
42	32
43	33
44	34
45	35
46	36
47	36
48	36
49	36
50	36
51	37
52	38
53	39
54	40
55	41
56	42
57	43
58	44
59	45
60	46
61	47
62	48
63	49
64	50
65	50
66	50
67	50
68	50
69	50
70	51
71	52
72	53
73	54
74	55
75	56
76	57
77	58
78	59
79	60
80	61
81	62
82	63
83	64
84	65
85	66
86	67
87	68
88	69
89	69
90	69
91	69
92	69
93	69
94	69
95	69
96	70
97	71