A345303 - cp's OEIS frontend

A345303 a(n) = Sum_{p|n, p prime} p * gcd(p,n/p).

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

[0, 2, 3, 4, 5, 5, 7, 4, 9, 7, 11, 7, 13, 9, 8, 4, 17, 11, 19, 9, 10, 13, 23, 7, 25, 15, 9, 11, 29, 10, 31, 4, 14, 19, 12, 13, 37, 21, 16, 9, 41, 12, 43, 15, 14, 25, 47, 7, 49, 27, 20, 17, 53, 11, 16, 11, 22, 31, 59, 12, 61, 33, 16, 4, 18, 16, 67, 21, 26, 14, 71, 13, 73, 39, 28]

cp's OEIS Frontend

A345303 a(n) = Sum_{p|n, p prime} p * gcd(p,n/p).

Table of values

List of values

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

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

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