A343224 - cp's OEIS frontend

A343224 a(n) = sigma(n) - A003415(n), where A003415 is the arithmetic derivative, and sigma is the sum of divisors of n.

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

[1, 2, 3, 3, 5, 7, 7, 3, 7, 11, 11, 12, 13, 15, 16, -1, 17, 18, 19, 18, 22, 23, 23, 16, 21, 27, 13, 24, 29, 41, 31, -17, 34, 35, 36, 31, 37, 39, 40, 22, 41, 55, 43, 36, 39, 47, 47, 12, 43, 48, 52, 42, 53, 39, 56, 28, 58, 59, 59, 76, 61, 63, 53, -65, 66, 83, 67, 54, 70, 85, 71, 39, 73, 75, 69, 60, 78, 97, 79, 10, 13]

cp's OEIS Frontend

A343224 a(n) = sigma(n) - A003415(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	2
3	3
4	3
5	5
6	7
7	7
8	3
9	7
10	11
11	11
12	12
13	13
14	15
15	16
16	-1
17	17
18	18
19	19
20	18
21	22
22	23
23	23
24	16
25	21
26	27
27	13
28	24
29	29
30	41
31	31
32	-17
33	34
34	35
35	36
36	31
37	37
38	39
39	40
40	22
41	41
42	55
43	43
44	36
45	39
46	47
47	47
48	12
49	43
50	48
51	52
52	42
53	53
54	39
55	56
56	28
57	58
58	59
59	59
60	76
61	61
62	63
63	53
64	-65
65	66
66	83
67	67
68	54
69	70
70	85
71	71
72	39
73	73
74	75
75	69
76	60
77	78
78	97
79	79
80	10
81	13

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

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