A348304 - cp's OEIS frontend

A348304 a(n) = Sum_{d|n} d'', where d'' is the second arithmetic derivative of d (A068346).

n	a(n)
1	0
2	0
3	0
4	4
5	0
6	1
7	0
8	20
9	5
10	1
11	0
12	37
13	0
14	6
15	12
16	100
17	0
18	16
19	0
20	49
21	7
22	1
23	0
24	101
25	7
26	8
27	32
28	90
29	0
30	15
31	0
32	276
33	9
34	1
35	16
36	144
37	0
38	10
39	32
40	137
41	0
42	15
43	0
44	117
45	33
46	10
47	0
48	421
49	9
50	47
51	24
52	104
53	0
54	151
55	32
56	202
57	13
58	1
59	0
60	191
61	0
62	14
63	32
64	916
65	21
66	12
67	0
68	161
69	15
70	24
71	0
72	428
73	0
74	16
75	35

[0, 0, 0, 4, 0, 1, 0, 20, 5, 1, 0, 37, 0, 6, 12, 100, 0, 16, 0, 49, 7, 1, 0, 101, 7, 8, 32, 90, 0, 15, 0, 276, 9, 1, 16, 144, 0, 10, 32, 137, 0, 15, 0, 117, 33, 10, 0, 421, 9, 47, 24, 104, 0, 151, 32, 202, 13, 1, 0, 191, 0, 14, 32, 916, 21, 12, 0, 161, 15, 24, 0, 428, 0, 16, 35]

cp's OEIS Frontend

A348304 a(n) = Sum_{d|n} d'', where d'' is the second arithmetic derivative of d (A068346).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	4
5	0
6	1
7	0
8	20
9	5
10	1
11	0
12	37
13	0
14	6
15	12
16	100
17	0
18	16
19	0
20	49
21	7
22	1
23	0
24	101
25	7
26	8
27	32
28	90
29	0
30	15
31	0
32	276
33	9
34	1
35	16
36	144
37	0
38	10
39	32
40	137
41	0
42	15
43	0
44	117
45	33
46	10
47	0
48	421
49	9
50	47
51	24
52	104
53	0
54	151
55	32
56	202
57	13
58	1
59	0
60	191
61	0
62	14
63	32
64	916
65	21
66	12
67	0
68	161
69	15
70	24
71	0
72	428
73	0
74	16
75	35

n	a(n)
1	0
2	0
3	0
4	4
5	0
6	1
7	0
8	20
9	5
10	1
11	0
12	37
13	0
14	6
15	12
16	100
17	0
18	16
19	0
20	49
21	7
22	1
23	0
24	101
25	7
26	8
27	32
28	90
29	0
30	15
31	0
32	276
33	9
34	1
35	16
36	144
37	0
38	10
39	32
40	137
41	0
42	15
43	0
44	117
45	33
46	10
47	0
48	421
49	9
50	47
51	24
52	104
53	0
54	151
55	32
56	202
57	13
58	1
59	0
60	191
61	0
62	14
63	32
64	916
65	21
66	12
67	0
68	161
69	15
70	24
71	0
72	428
73	0
74	16
75	35

n	a(n)
1	0
2	0
3	0
4	4
5	0
6	1
7	0
8	20
9	5
10	1
11	0
12	37
13	0
14	6
15	12
16	100
17	0
18	16
19	0
20	49
21	7
22	1
23	0
24	101
25	7
26	8
27	32
28	90
29	0
30	15
31	0
32	276
33	9
34	1
35	16
36	144
37	0
38	10
39	32
40	137
41	0
42	15
43	0
44	117
45	33
46	10
47	0
48	421
49	9
50	47
51	24
52	104
53	0
54	151
55	32
56	202
57	13
58	1
59	0
60	191
61	0
62	14
63	32
64	916
65	21
66	12
67	0
68	161
69	15
70	24
71	0
72	428
73	0
74	16
75	35