A342926 - cp's OEIS frontend

A342926 a(n) = A003415(sigma(n)) - n, where A003415 is the arithmetic derivative, and sigma is the sum of divisors of n.

n	a(n)
1	-1
2	-1
3	1
4	-3
5	0
6	10
7	5
8	0
9	-8
10	11
11	5
12	20
13	-4
14	30
15	29
16	-15
17	4
18	-2
19	5
20	21
21	59
22	38
23	21
24	68
25	-24
26	15
27	41
28	64
29	2
30	126
31	49
32	19
33	79
34	47
35	77
36	-16
37	-16
38	54
39	53
40	83
41	0
42	230
43	5
44	80
45	26
46	110
47	65
48	80
49	-27
50	-16
51	105
52	25
53	28
54	190
55	101
56	188
57	119
58	65
59	33
60	272
61	-28
62	210
63	101
64	-63
65	59
66	318
67	5
68	97
69	203
70	314
71	85
72	47
73	-34
74	27
75	53
76	112
77	195

[-1, -1, 1, -3, 0, 10, 5, 0, -8, 11, 5, 20, -4, 30, 29, -15, 4, -2, 5, 21, 59, 38, 21, 68, -24, 15, 41, 64, 2, 126, 49, 19, 79, 47, 77, -16, -16, 54, 53, 83, 0, 230, 5, 80, 26, 110, 65, 80, -27, -16, 105, 25, 28, 190, 101, 188, 119, 65, 33, 272, -28, 210, 101, -63, 59, 318, 5, 97, 203, 314, 85, 47, -34, 27, 53, 112, 195]

cp's OEIS Frontend

A342926 a(n) = A003415(sigma(n)) - n, where A003415 is the arithmetic derivative, and sigma is the sum of divisors of n.

Table of values

List of values

n	a(n)
1	-1
2	-1
3	1
4	-3
5	0
6	10
7	5
8	0
9	-8
10	11
11	5
12	20
13	-4
14	30
15	29
16	-15
17	4
18	-2
19	5
20	21
21	59
22	38
23	21
24	68
25	-24
26	15
27	41
28	64
29	2
30	126
31	49
32	19
33	79
34	47
35	77
36	-16
37	-16
38	54
39	53
40	83
41	0
42	230
43	5
44	80
45	26
46	110
47	65
48	80
49	-27
50	-16
51	105
52	25
53	28
54	190
55	101
56	188
57	119
58	65
59	33
60	272
61	-28
62	210
63	101
64	-63
65	59
66	318
67	5
68	97
69	203
70	314
71	85
72	47
73	-34
74	27
75	53
76	112
77	195

n	a(n)
1	-1
2	-1
3	1
4	-3
5	0
6	10
7	5
8	0
9	-8
10	11
11	5
12	20
13	-4
14	30
15	29
16	-15
17	4
18	-2
19	5
20	21
21	59
22	38
23	21
24	68
25	-24
26	15
27	41
28	64
29	2
30	126
31	49
32	19
33	79
34	47
35	77
36	-16
37	-16
38	54
39	53
40	83
41	0
42	230
43	5
44	80
45	26
46	110
47	65
48	80
49	-27
50	-16
51	105
52	25
53	28
54	190
55	101
56	188
57	119
58	65
59	33
60	272
61	-28
62	210
63	101
64	-63
65	59
66	318
67	5
68	97
69	203
70	314
71	85
72	47
73	-34
74	27
75	53
76	112
77	195

n	a(n)
1	-1
2	-1
3	1
4	-3
5	0
6	10
7	5
8	0
9	-8
10	11
11	5
12	20
13	-4
14	30
15	29
16	-15
17	4
18	-2
19	5
20	21
21	59
22	38
23	21
24	68
25	-24
26	15
27	41
28	64
29	2
30	126
31	49
32	19
33	79
34	47
35	77
36	-16
37	-16
38	54
39	53
40	83
41	0
42	230
43	5
44	80
45	26
46	110
47	65
48	80
49	-27
50	-16
51	105
52	25
53	28
54	190
55	101
56	188
57	119
58	65
59	33
60	272
61	-28
62	210
63	101
64	-63
65	59
66	318
67	5
68	97
69	203
70	314
71	85
72	47
73	-34
74	27
75	53
76	112
77	195