A053045 - cp's OEIS frontend

A053045 a(n) is the number of powers of 2 among the iterates of the Euler phi function when it is iterated with initial value n!.

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	7
7	8
8	11
9	11
10	14
11	17
12	19
13	21
14	23
15	25
16	29
17	33
18	34
19	35
20	39
21	40
22	44
23	48
24	51
25	55
26	58
27	58
28	61
29	64
30	67
31	70
32	75
33	78
34	83
35	86
36	88
37	90
38	92
39	94
40	99
41	104
42	106
43	108
44	113
45	115
46	120
47	125
48	129
49	131
50	136
51	140
52	144
53	148
54	149
55	154
56	158
57	159
58	163
59	167
60	171
61	175
62	179
63	180

[1, 2, 2, 4, 6, 7, 8, 11, 11, 14, 17, 19, 21, 23, 25, 29, 33, 34, 35, 39, 40, 44, 48, 51, 55, 58, 58, 61, 64, 67, 70, 75, 78, 83, 86, 88, 90, 92, 94, 99, 104, 106, 108, 113, 115, 120, 125, 129, 131, 136, 140, 144, 148, 149, 154, 158, 159, 163, 167, 171, 175, 179, 180]

cp's OEIS Frontend

A053045 a(n) is the number of powers of 2 among the iterates of the Euler phi function when it is iterated with initial value n!.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	7
7	8
8	11
9	11
10	14
11	17
12	19
13	21
14	23
15	25
16	29
17	33
18	34
19	35
20	39
21	40
22	44
23	48
24	51
25	55
26	58
27	58
28	61
29	64
30	67
31	70
32	75
33	78
34	83
35	86
36	88
37	90
38	92
39	94
40	99
41	104
42	106
43	108
44	113
45	115
46	120
47	125
48	129
49	131
50	136
51	140
52	144
53	148
54	149
55	154
56	158
57	159
58	163
59	167
60	171
61	175
62	179
63	180

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	7
7	8
8	11
9	11
10	14
11	17
12	19
13	21
14	23
15	25
16	29
17	33
18	34
19	35
20	39
21	40
22	44
23	48
24	51
25	55
26	58
27	58
28	61
29	64
30	67
31	70
32	75
33	78
34	83
35	86
36	88
37	90
38	92
39	94
40	99
41	104
42	106
43	108
44	113
45	115
46	120
47	125
48	129
49	131
50	136
51	140
52	144
53	148
54	149
55	154
56	158
57	159
58	163
59	167
60	171
61	175
62	179
63	180

n	a(n)
1	1
2	2
3	2
4	4
5	6
6	7
7	8
8	11
9	11
10	14
11	17
12	19
13	21
14	23
15	25
16	29
17	33
18	34
19	35
20	39
21	40
22	44
23	48
24	51
25	55
26	58
27	58
28	61
29	64
30	67
31	70
32	75
33	78
34	83
35	86
36	88
37	90
38	92
39	94
40	99
41	104
42	106
43	108
44	113
45	115
46	120
47	125
48	129
49	131
50	136
51	140
52	144
53	148
54	149
55	154
56	158
57	159
58	163
59	167
60	171
61	175
62	179
63	180