A087266 - cp's OEIS frontend

A087266 a(n) = gcd(2^n, pi(2^n)) = gcd(A000079(n), A007053(n)).

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

[1, 2, 4, 2, 1, 2, 1, 2, 1, 4, 1, 4, 4, 4, 8, 2, 1, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 1, 1, 2, 1, 1, 1, 4, 4, 2, 4, 4, 1, 1, 4, 2, 1, 1, 2, 2, 1, 8, 1, 4, 16, 1, 2, 4, 2, 4, 2, 1, 1, 8, 1, 4, 1, 1, 2, 16, 1, 1, 1, 1, 4, 1, 1, 4, 8, 1, 4, 4, 8, 4, 4, 2, 1, 1, 2, 4, 8, 16, 2]

cp's OEIS Frontend

A087266 a(n) = gcd(2^n, pi(2^n)) = gcd(A000079(n), A007053(n)).

Table of values

List of values

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

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

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