A306071 - cp's OEIS frontend

A306071 Decimal expansion of Sum_{n>=1} (-1)^omega(n) phi(n)^2/n^4, where omega(n) is the number of distinct prime factors of n (A001221) and phi is Euler's totient function (A000010).

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

[8, 0, 7, 3, 3, 0, 8, 2, 1, 6, 3, 6, 2, 0, 5, 0, 3, 9, 1, 4, 8, 6, 5, 4, 2, 7, 9, 9, 3, 0, 0, 3, 1, 1, 3, 4, 0, 2, 5, 8, 4, 5, 8, 2, 5, 0, 8, 1, 5, 5, 6, 6, 4, 4, 0, 1, 8, 0, 0, 5, 2, 0, 7, 7, 0, 4, 4, 1, 3, 8, 1, 4, 8, 4, 9, 3, 7, 5, 1, 8, 6, 4, 9, 6, 9, 5, 6, 0, 9, 3, 5, 0, 9, 6, 2, 9, 4, 8, 3, 7, 6, 5, 0, 1, 1, 8]

cp's OEIS Frontend

A306071 Decimal expansion of Sum_{n>=1} (-1)^omega(n) phi(n)^2/n^4, where omega(n) is the number of distinct prime factors of n (A001221) and phi is Euler's totient function (A000010).

Table of values

List of values

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

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

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