A060609 - cp's OEIS frontend

A060609 Repeatedly apply Euler phi to n-th prime; a(n) = highest power of 2 that is seen.

n	a(n)
1	2
2	2
3	4
4	2
5	4
6	4
7	16
8	2
9	4
10	4
11	8
12	4
13	16
14	4
15	4
16	8
17	4
18	16
19	8
20	8
21	8
22	8
23	16
24	16
25	32
26	16
27	32
28	8
29	4
30	16
31	4
32	16
33	64
34	8
35	8
36	16
37	16
38	2
39	16
40	8
41	16
42	16
43	8
44	64
45	8
46	16
47	16
48	8
49	16
50	8
51	16
52	32
53	64
54	16
55	256
56	16
57	16
58	8
59	16
60	32
61	8
62	16
63	32
64	32
65	32
66	16
67	32
68	32
69	8
70	16
71	64
72	16
73	32
74	32
75	4
76	8
77	64
78	32
79	64
80	128

[2, 2, 4, 2, 4, 4, 16, 2, 4, 4, 8, 4, 16, 4, 4, 8, 4, 16, 8, 8, 8, 8, 16, 16, 32, 16, 32, 8, 4, 16, 4, 16, 64, 8, 8, 16, 16, 2, 16, 8, 16, 16, 8, 64, 8, 16, 16, 8, 16, 8, 16, 32, 64, 16, 256, 16, 16, 8, 16, 32, 8, 16, 32, 32, 32, 16, 32, 32, 8, 16, 64, 16, 32, 32, 4, 8, 64, 32, 64, 128]

cp's OEIS Frontend

A060609 Repeatedly apply Euler phi to n-th prime; a(n) = highest power of 2 that is seen.

Table of values

List of values

n	a(n)
1	2
2	2
3	4
4	2
5	4
6	4
7	16
8	2
9	4
10	4
11	8
12	4
13	16
14	4
15	4
16	8
17	4
18	16
19	8
20	8
21	8
22	8
23	16
24	16
25	32
26	16
27	32
28	8
29	4
30	16
31	4
32	16
33	64
34	8
35	8
36	16
37	16
38	2
39	16
40	8
41	16
42	16
43	8
44	64
45	8
46	16
47	16
48	8
49	16
50	8
51	16
52	32
53	64
54	16
55	256
56	16
57	16
58	8
59	16
60	32
61	8
62	16
63	32
64	32
65	32
66	16
67	32
68	32
69	8
70	16
71	64
72	16
73	32
74	32
75	4
76	8
77	64
78	32
79	64
80	128

n	a(n)
1	2
2	2
3	4
4	2
5	4
6	4
7	16
8	2
9	4
10	4
11	8
12	4
13	16
14	4
15	4
16	8
17	4
18	16
19	8
20	8
21	8
22	8
23	16
24	16
25	32
26	16
27	32
28	8
29	4
30	16
31	4
32	16
33	64
34	8
35	8
36	16
37	16
38	2
39	16
40	8
41	16
42	16
43	8
44	64
45	8
46	16
47	16
48	8
49	16
50	8
51	16
52	32
53	64
54	16
55	256
56	16
57	16
58	8
59	16
60	32
61	8
62	16
63	32
64	32
65	32
66	16
67	32
68	32
69	8
70	16
71	64
72	16
73	32
74	32
75	4
76	8
77	64
78	32
79	64
80	128

n	a(n)
1	2
2	2
3	4
4	2
5	4
6	4
7	16
8	2
9	4
10	4
11	8
12	4
13	16
14	4
15	4
16	8
17	4
18	16
19	8
20	8
21	8
22	8
23	16
24	16
25	32
26	16
27	32
28	8
29	4
30	16
31	4
32	16
33	64
34	8
35	8
36	16
37	16
38	2
39	16
40	8
41	16
42	16
43	8
44	64
45	8
46	16
47	16
48	8
49	16
50	8
51	16
52	32
53	64
54	16
55	256
56	16
57	16
58	8
59	16
60	32
61	8
62	16
63	32
64	32
65	32
66	16
67	32
68	32
69	8
70	16
71	64
72	16
73	32
74	32
75	4
76	8
77	64
78	32
79	64
80	128