A107473 - cp's OEIS frontend

A107473 Sum of numerator and denominator of Product_{p|n, p prime} (1 - 1/p).

n	a(n)
1	2
2	3
3	5
4	3
5	9
6	4
7	13
8	3
9	5
10	7
11	21
12	4
13	25
14	10
15	23
16	3
17	33
18	4
19	37
20	7
21	11
22	16
23	45
24	4
25	9
26	19
27	5
28	10
29	57
30	19
31	61
32	3
33	53
34	25
35	59
36	4
37	73
38	28
39	21
40	7
41	81
42	9
43	85
44	16
45	23
46	34
47	93
48	4
49	13
50	7
51	83
52	19
53	105
54	4
55	19
56	10
57	31
58	43
59	117
60	19
61	121
62	46
63	11
64	3
65	113
66	43
67	133
68	25
69	113
70	47
71	141
72	4
73	145
74	55
75	23
76	28

[2, 3, 5, 3, 9, 4, 13, 3, 5, 7, 21, 4, 25, 10, 23, 3, 33, 4, 37, 7, 11, 16, 45, 4, 9, 19, 5, 10, 57, 19, 61, 3, 53, 25, 59, 4, 73, 28, 21, 7, 81, 9, 85, 16, 23, 34, 93, 4, 13, 7, 83, 19, 105, 4, 19, 10, 31, 43, 117, 19, 121, 46, 11, 3, 113, 43, 133, 25, 113, 47, 141, 4, 145, 55, 23, 28]

cp's OEIS Frontend

A107473 Sum of numerator and denominator of Product_{p|n, p prime} (1 - 1/p).

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	3
5	9
6	4
7	13
8	3
9	5
10	7
11	21
12	4
13	25
14	10
15	23
16	3
17	33
18	4
19	37
20	7
21	11
22	16
23	45
24	4
25	9
26	19
27	5
28	10
29	57
30	19
31	61
32	3
33	53
34	25
35	59
36	4
37	73
38	28
39	21
40	7
41	81
42	9
43	85
44	16
45	23
46	34
47	93
48	4
49	13
50	7
51	83
52	19
53	105
54	4
55	19
56	10
57	31
58	43
59	117
60	19
61	121
62	46
63	11
64	3
65	113
66	43
67	133
68	25
69	113
70	47
71	141
72	4
73	145
74	55
75	23
76	28

n	a(n)
1	2
2	3
3	5
4	3
5	9
6	4
7	13
8	3
9	5
10	7
11	21
12	4
13	25
14	10
15	23
16	3
17	33
18	4
19	37
20	7
21	11
22	16
23	45
24	4
25	9
26	19
27	5
28	10
29	57
30	19
31	61
32	3
33	53
34	25
35	59
36	4
37	73
38	28
39	21
40	7
41	81
42	9
43	85
44	16
45	23
46	34
47	93
48	4
49	13
50	7
51	83
52	19
53	105
54	4
55	19
56	10
57	31
58	43
59	117
60	19
61	121
62	46
63	11
64	3
65	113
66	43
67	133
68	25
69	113
70	47
71	141
72	4
73	145
74	55
75	23
76	28

n	a(n)
1	2
2	3
3	5
4	3
5	9
6	4
7	13
8	3
9	5
10	7
11	21
12	4
13	25
14	10
15	23
16	3
17	33
18	4
19	37
20	7
21	11
22	16
23	45
24	4
25	9
26	19
27	5
28	10
29	57
30	19
31	61
32	3
33	53
34	25
35	59
36	4
37	73
38	28
39	21
40	7
41	81
42	9
43	85
44	16
45	23
46	34
47	93
48	4
49	13
50	7
51	83
52	19
53	105
54	4
55	19
56	10
57	31
58	43
59	117
60	19
61	121
62	46
63	11
64	3
65	113
66	43
67	133
68	25
69	113
70	47
71	141
72	4
73	145
74	55
75	23
76	28