A339815 - cp's OEIS frontend

A339815 Let x = A019565(2*n); a(n) is the difference between 2-adic valuations of phi(x) and (x-1).

n	a(n)
1	0
2	0
3	2
4	0
5	0
6	2
7	1
8	0
9	-3
10	2
11	2
12	0
13	2
14	-3
15	4
16	0
17	2
18	-2
19	4
20	2
21	0
22	4
23	4
24	2
25	2
26	4
27	1
28	1
29	4
30	4
31	6
32	0
33	4
34	4
35	6
36	4
37	4
38	6
39	5
40	4
41	2
42	6
43	6
44	4
45	6
46	4
47	8
48	4
49	6
50	4
51	8
52	6
53	3
54	8
55	8
56	6
57	6
58	8
59	6
60	5
61	8
62	8
63	10
64	0
65	-1
66	2
67	2
68	0
69	2
70	1
71	4
72	-2
73	2
74	2
75	4
76	2
77	2
78	4
79	3
80	2
81	2
82	4
83	3
84	-2
85	4
86	4
87	6
88	2
89	4
90	2
91	6
92	4
93	1
94	6
95	6
96	4
97	3
98	6
99	6
100	4
101	6
102	5
103	8
104	1
105	6

[0, 0, 2, 0, 0, 2, 1, 0, -3, 2, 2, 0, 2, -3, 4, 0, 2, -2, 4, 2, 0, 4, 4, 2, 2, 4, 1, 1, 4, 4, 6, 0, 4, 4, 6, 4, 4, 6, 5, 4, 2, 6, 6, 4, 6, 4, 8, 4, 6, 4, 8, 6, 3, 8, 8, 6, 6, 8, 6, 5, 8, 8, 10, 0, -1, 2, 2, 0, 2, 1, 4, -2, 2, 2, 4, 2, 2, 4, 3, 2, 2, 4, 3, -2, 4, 4, 6, 2, 4, 2, 6, 4, 1, 6, 6, 4, 3, 6, 6, 4, 6, 5, 8, 1, 6]

cp's OEIS Frontend

A339815 Let x = A019565(2*n); a(n) is the difference between 2-adic valuations of phi(x) and (x-1).

Table of values

List of values

n	a(n)
1	0
2	0
3	2
4	0
5	0
6	2
7	1
8	0
9	-3
10	2
11	2
12	0
13	2
14	-3
15	4
16	0
17	2
18	-2
19	4
20	2
21	0
22	4
23	4
24	2
25	2
26	4
27	1
28	1
29	4
30	4
31	6
32	0
33	4
34	4
35	6
36	4
37	4
38	6
39	5
40	4
41	2
42	6
43	6
44	4
45	6
46	4
47	8
48	4
49	6
50	4
51	8
52	6
53	3
54	8
55	8
56	6
57	6
58	8
59	6
60	5
61	8
62	8
63	10
64	0
65	-1
66	2
67	2
68	0
69	2
70	1
71	4
72	-2
73	2
74	2
75	4
76	2
77	2
78	4
79	3
80	2
81	2
82	4
83	3
84	-2
85	4
86	4
87	6
88	2
89	4
90	2
91	6
92	4
93	1
94	6
95	6
96	4
97	3
98	6
99	6
100	4
101	6
102	5
103	8
104	1
105	6

n	a(n)
1	0
2	0
3	2
4	0
5	0
6	2
7	1
8	0
9	-3
10	2
11	2
12	0
13	2
14	-3
15	4
16	0
17	2
18	-2
19	4
20	2
21	0
22	4
23	4
24	2
25	2
26	4
27	1
28	1
29	4
30	4
31	6
32	0
33	4
34	4
35	6
36	4
37	4
38	6
39	5
40	4
41	2
42	6
43	6
44	4
45	6
46	4
47	8
48	4
49	6
50	4
51	8
52	6
53	3
54	8
55	8
56	6
57	6
58	8
59	6
60	5
61	8
62	8
63	10
64	0
65	-1
66	2
67	2
68	0
69	2
70	1
71	4
72	-2
73	2
74	2
75	4
76	2
77	2
78	4
79	3
80	2
81	2
82	4
83	3
84	-2
85	4
86	4
87	6
88	2
89	4
90	2
91	6
92	4
93	1
94	6
95	6
96	4
97	3
98	6
99	6
100	4
101	6
102	5
103	8
104	1
105	6

n	a(n)
1	0
2	0
3	2
4	0
5	0
6	2
7	1
8	0
9	-3
10	2
11	2
12	0
13	2
14	-3
15	4
16	0
17	2
18	-2
19	4
20	2
21	0
22	4
23	4
24	2
25	2
26	4
27	1
28	1
29	4
30	4
31	6
32	0
33	4
34	4
35	6
36	4
37	4
38	6
39	5
40	4
41	2
42	6
43	6
44	4
45	6
46	4
47	8
48	4
49	6
50	4
51	8
52	6
53	3
54	8
55	8
56	6
57	6
58	8
59	6
60	5
61	8
62	8
63	10
64	0
65	-1
66	2
67	2
68	0
69	2
70	1
71	4
72	-2
73	2
74	2
75	4
76	2
77	2
78	4
79	3
80	2
81	2
82	4
83	3
84	-2
85	4
86	4
87	6
88	2
89	4
90	2
91	6
92	4
93	1
94	6
95	6
96	4
97	3
98	6
99	6
100	4
101	6
102	5
103	8
104	1
105	6