A053097 - cp's OEIS frontend

A053097 a(n) is the number of powers of 2 among the iterates of the Euler phi function when it is iterated with initial value A002110(n), the n-th primorial number.

n	a(n)
1	2
2	2
3	4
4	5
5	8
6	10
7	14
8	15
9	19
10	22
11	25
12	27
13	32
14	34
15	39
16	43
17	47
18	51
19	55
20	59
21	62
22	65
23	71
24	77
25	82
26	88
27	93
28	98
29	100
30	105
31	107
32	112
33	119
34	124
35	128
36	133
37	137
38	138
39	145
40	149
41	156
42	160
43	164
44	170
45	174
46	178
47	182
48	185
49	191
50	194
51	200
52	206
53	212
54	219
55	227
56	233
57	239
58	242
59	248
60	254

[2, 2, 4, 5, 8, 10, 14, 15, 19, 22, 25, 27, 32, 34, 39, 43, 47, 51, 55, 59, 62, 65, 71, 77, 82, 88, 93, 98, 100, 105, 107, 112, 119, 124, 128, 133, 137, 138, 145, 149, 156, 160, 164, 170, 174, 178, 182, 185, 191, 194, 200, 206, 212, 219, 227, 233, 239, 242, 248, 254]

cp's OEIS Frontend

A053097 a(n) is the number of powers of 2 among the iterates of the Euler phi function when it is iterated with initial value A002110(n), the n-th primorial number.

Table of values

List of values

n	a(n)
1	2
2	2
3	4
4	5
5	8
6	10
7	14
8	15
9	19
10	22
11	25
12	27
13	32
14	34
15	39
16	43
17	47
18	51
19	55
20	59
21	62
22	65
23	71
24	77
25	82
26	88
27	93
28	98
29	100
30	105
31	107
32	112
33	119
34	124
35	128
36	133
37	137
38	138
39	145
40	149
41	156
42	160
43	164
44	170
45	174
46	178
47	182
48	185
49	191
50	194
51	200
52	206
53	212
54	219
55	227
56	233
57	239
58	242
59	248
60	254

n	a(n)
1	2
2	2
3	4
4	5
5	8
6	10
7	14
8	15
9	19
10	22
11	25
12	27
13	32
14	34
15	39
16	43
17	47
18	51
19	55
20	59
21	62
22	65
23	71
24	77
25	82
26	88
27	93
28	98
29	100
30	105
31	107
32	112
33	119
34	124
35	128
36	133
37	137
38	138
39	145
40	149
41	156
42	160
43	164
44	170
45	174
46	178
47	182
48	185
49	191
50	194
51	200
52	206
53	212
54	219
55	227
56	233
57	239
58	242
59	248
60	254

n	a(n)
1	2
2	2
3	4
4	5
5	8
6	10
7	14
8	15
9	19
10	22
11	25
12	27
13	32
14	34
15	39
16	43
17	47
18	51
19	55
20	59
21	62
22	65
23	71
24	77
25	82
26	88
27	93
28	98
29	100
30	105
31	107
32	112
33	119
34	124
35	128
36	133
37	137
38	138
39	145
40	149
41	156
42	160
43	164
44	170
45	174
46	178
47	182
48	185
49	191
50	194
51	200
52	206
53	212
54	219
55	227
56	233
57	239
58	242
59	248
60	254