A080998 - cp's OEIS frontend

A080998 a(n) is n's rank among the positive integers in terms of centrality -the fraction of n represented by the average gcd of n and the positive integers, or A018804(n)/n^2 (cf. A080997).

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	10
8	7
9	11
10	9
11	18
12	8
13	20
14	13
15	12
16	15
17	25
18	14
19	33
20	16
21	21
22	23
23	40
24	17
25	32
26	28
27	27
28	22
29	53
30	19
31	56
32	30
33	35
34	39
35	36
36	24
37	69
38	46
39	43
40	26
41	79
42	29
43	89
44	38
45	37
46	55
47	95
48	31
49	67
50	45
51	57
52	47
53	108
54	41
55	60
56	42
57	65
58	75

[1, 2, 3, 4, 6, 5, 10, 7, 11, 9, 18, 8, 20, 13, 12, 15, 25, 14, 33, 16, 21, 23, 40, 17, 32, 28, 27, 22, 53, 19, 56, 30, 35, 39, 36, 24, 69, 46, 43, 26, 79, 29, 89, 38, 37, 55, 95, 31, 67, 45, 57, 47, 108, 41, 60, 42, 65, 75]

cp's OEIS Frontend

A080998 a(n) is n's rank among the positive integers in terms of centrality -the fraction of n represented by the average gcd of n and the positive integers, or A018804(n)/n^2 (cf. A080997).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	10
8	7
9	11
10	9
11	18
12	8
13	20
14	13
15	12
16	15
17	25
18	14
19	33
20	16
21	21
22	23
23	40
24	17
25	32
26	28
27	27
28	22
29	53
30	19
31	56
32	30
33	35
34	39
35	36
36	24
37	69
38	46
39	43
40	26
41	79
42	29
43	89
44	38
45	37
46	55
47	95
48	31
49	67
50	45
51	57
52	47
53	108
54	41
55	60
56	42
57	65
58	75

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	10
8	7
9	11
10	9
11	18
12	8
13	20
14	13
15	12
16	15
17	25
18	14
19	33
20	16
21	21
22	23
23	40
24	17
25	32
26	28
27	27
28	22
29	53
30	19
31	56
32	30
33	35
34	39
35	36
36	24
37	69
38	46
39	43
40	26
41	79
42	29
43	89
44	38
45	37
46	55
47	95
48	31
49	67
50	45
51	57
52	47
53	108
54	41
55	60
56	42
57	65
58	75

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	10
8	7
9	11
10	9
11	18
12	8
13	20
14	13
15	12
16	15
17	25
18	14
19	33
20	16
21	21
22	23
23	40
24	17
25	32
26	28
27	27
28	22
29	53
30	19
31	56
32	30
33	35
34	39
35	36
36	24
37	69
38	46
39	43
40	26
41	79
42	29
43	89
44	38
45	37
46	55
47	95
48	31
49	67
50	45
51	57
52	47
53	108
54	41
55	60
56	42
57	65
58	75