A053099 - cp's OEIS frontend

A053099 When the Euler phi function is iterated with initial value A002110(n) = n-th primorial, a(n) = exponent of largest power of 2 arising in the iteration.

n	a(n)
1	1
2	1
3	3
4	4
5	7
6	9
7	13
8	14
9	18
10	21
11	24
12	26
13	31
14	33
15	38
16	42
17	46
18	50
19	54
20	58
21	61
22	64
23	70
24	76
25	81
26	87
27	92
28	97
29	99
30	104
31	106
32	111
33	118
34	123
35	127
36	132
37	136
38	137
39	144
40	148
41	155
42	159
43	163
44	169
45	173
46	177
47	181
48	184
49	190
50	193
51	199
52	205
53	211
54	218
55	226
56	232
57	238
58	241
59	247
60	253

[1, 1, 3, 4, 7, 9, 13, 14, 18, 21, 24, 26, 31, 33, 38, 42, 46, 50, 54, 58, 61, 64, 70, 76, 81, 87, 92, 97, 99, 104, 106, 111, 118, 123, 127, 132, 136, 137, 144, 148, 155, 159, 163, 169, 173, 177, 181, 184, 190, 193, 199, 205, 211, 218, 226, 232, 238, 241, 247, 253]

cp's OEIS Frontend

A053099 When the Euler phi function is iterated with initial value A002110(n) = n-th primorial, a(n) = exponent of largest power of 2 arising in the iteration.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	4
5	7
6	9
7	13
8	14
9	18
10	21
11	24
12	26
13	31
14	33
15	38
16	42
17	46
18	50
19	54
20	58
21	61
22	64
23	70
24	76
25	81
26	87
27	92
28	97
29	99
30	104
31	106
32	111
33	118
34	123
35	127
36	132
37	136
38	137
39	144
40	148
41	155
42	159
43	163
44	169
45	173
46	177
47	181
48	184
49	190
50	193
51	199
52	205
53	211
54	218
55	226
56	232
57	238
58	241
59	247
60	253

n	a(n)
1	1
2	1
3	3
4	4
5	7
6	9
7	13
8	14
9	18
10	21
11	24
12	26
13	31
14	33
15	38
16	42
17	46
18	50
19	54
20	58
21	61
22	64
23	70
24	76
25	81
26	87
27	92
28	97
29	99
30	104
31	106
32	111
33	118
34	123
35	127
36	132
37	136
38	137
39	144
40	148
41	155
42	159
43	163
44	169
45	173
46	177
47	181
48	184
49	190
50	193
51	199
52	205
53	211
54	218
55	226
56	232
57	238
58	241
59	247
60	253

n	a(n)
1	1
2	1
3	3
4	4
5	7
6	9
7	13
8	14
9	18
10	21
11	24
12	26
13	31
14	33
15	38
16	42
17	46
18	50
19	54
20	58
21	61
22	64
23	70
24	76
25	81
26	87
27	92
28	97
29	99
30	104
31	106
32	111
33	118
34	123
35	127
36	132
37	136
38	137
39	144
40	148
41	155
42	159
43	163
44	169
45	173
46	177
47	181
48	184
49	190
50	193
51	199
52	205
53	211
54	218
55	226
56	232
57	238
58	241
59	247
60	253