A094472 - cp's OEIS frontend

A094472 a(n) = n*tau(n) - sigma(n) - phi(n), where tau(n) is the number of divisors of n.

n	a(n)
1	-1
2	0
3	0
4	3
5	0
6	10
7	0
8	13
9	8
10	18
11	0
12	40
13	0
14	26
15	28
16	41
17	0
18	63
19	0
20	70
21	40
22	42
23	0
24	124
25	24
26	50
27	50
28	100
29	0
30	160
31	0
32	113
33	64
34	66
35	68
36	221
37	0
38	74
39	76
40	214
41	0
42	228
43	0
44	160
45	168
46	90
47	0
48	340
49	48
50	187
51	100
52	190
53	0
54	294
55	108
56	304
57	112
58	114
59	0
60	536
61	0
62	122
63	238
64	289
65	128
66	364
67	0
68	250
69	136
70	392
71	0
72	645
73	0
74	146
75	286
76	280
77	152
78	432
79	0
80	582

[-1, 0, 0, 3, 0, 10, 0, 13, 8, 18, 0, 40, 0, 26, 28, 41, 0, 63, 0, 70, 40, 42, 0, 124, 24, 50, 50, 100, 0, 160, 0, 113, 64, 66, 68, 221, 0, 74, 76, 214, 0, 228, 0, 160, 168, 90, 0, 340, 48, 187, 100, 190, 0, 294, 108, 304, 112, 114, 0, 536, 0, 122, 238, 289, 128, 364, 0, 250, 136, 392, 0, 645, 0, 146, 286, 280, 152, 432, 0, 582]

cp's OEIS Frontend

A094472 a(n) = n*tau(n) - sigma(n) - phi(n), where tau(n) is the number of divisors of n.

Table of values

List of values

n	a(n)
1	-1
2	0
3	0
4	3
5	0
6	10
7	0
8	13
9	8
10	18
11	0
12	40
13	0
14	26
15	28
16	41
17	0
18	63
19	0
20	70
21	40
22	42
23	0
24	124
25	24
26	50
27	50
28	100
29	0
30	160
31	0
32	113
33	64
34	66
35	68
36	221
37	0
38	74
39	76
40	214
41	0
42	228
43	0
44	160
45	168
46	90
47	0
48	340
49	48
50	187
51	100
52	190
53	0
54	294
55	108
56	304
57	112
58	114
59	0
60	536
61	0
62	122
63	238
64	289
65	128
66	364
67	0
68	250
69	136
70	392
71	0
72	645
73	0
74	146
75	286
76	280
77	152
78	432
79	0
80	582

n	a(n)
1	-1
2	0
3	0
4	3
5	0
6	10
7	0
8	13
9	8
10	18
11	0
12	40
13	0
14	26
15	28
16	41
17	0
18	63
19	0
20	70
21	40
22	42
23	0
24	124
25	24
26	50
27	50
28	100
29	0
30	160
31	0
32	113
33	64
34	66
35	68
36	221
37	0
38	74
39	76
40	214
41	0
42	228
43	0
44	160
45	168
46	90
47	0
48	340
49	48
50	187
51	100
52	190
53	0
54	294
55	108
56	304
57	112
58	114
59	0
60	536
61	0
62	122
63	238
64	289
65	128
66	364
67	0
68	250
69	136
70	392
71	0
72	645
73	0
74	146
75	286
76	280
77	152
78	432
79	0
80	582

n	a(n)
1	-1
2	0
3	0
4	3
5	0
6	10
7	0
8	13
9	8
10	18
11	0
12	40
13	0
14	26
15	28
16	41
17	0
18	63
19	0
20	70
21	40
22	42
23	0
24	124
25	24
26	50
27	50
28	100
29	0
30	160
31	0
32	113
33	64
34	66
35	68
36	221
37	0
38	74
39	76
40	214
41	0
42	228
43	0
44	160
45	168
46	90
47	0
48	340
49	48
50	187
51	100
52	190
53	0
54	294
55	108
56	304
57	112
58	114
59	0
60	536
61	0
62	122
63	238
64	289
65	128
66	364
67	0
68	250
69	136
70	392
71	0
72	645
73	0
74	146
75	286
76	280
77	152
78	432
79	0
80	582