A058972 - cp's OEIS frontend

A058972 For a rational number p/q let f(p/q) = sum of aliquot divisors of p+q divided by number of divisors of p+q; sequence gives numbers k such that, starting at k/1 and iterating f, an integer is eventually reached.

n	a(n)
1	3
2	9
3	15
4	24
5	25
6	29
7	33
8	35
9	50
10	51
11	55
12	57
13	59
14	63
15	73
16	79
17	80
18	81
19	85
20	87
21	89
22	90
23	95
24	99
25	105
26	119
27	120
28	121
29	128
30	131
31	139
32	143
33	145
34	169
35	177
36	179
37	181
38	183
39	193
40	195
41	201
42	203
43	204
44	211
45	215
46	217
47	218
48	219
49	221
50	225
51	227
52	233
53	247
54	248
55	255
56	273
57	275
58	288

[3, 9, 15, 24, 25, 29, 33, 35, 50, 51, 55, 57, 59, 63, 73, 79, 80, 81, 85, 87, 89, 90, 95, 99, 105, 119, 120, 121, 128, 131, 139, 143, 145, 169, 177, 179, 181, 183, 193, 195, 201, 203, 204, 211, 215, 217, 218, 219, 221, 225, 227, 233, 247, 248, 255, 273, 275, 288]

cp's OEIS Frontend

A058972 For a rational number p/q let f(p/q) = sum of aliquot divisors of p+q divided by number of divisors of p+q; sequence gives numbers k such that, starting at k/1 and iterating f, an integer is eventually reached.

Table of values

List of values

n	a(n)
1	3
2	9
3	15
4	24
5	25
6	29
7	33
8	35
9	50
10	51
11	55
12	57
13	59
14	63
15	73
16	79
17	80
18	81
19	85
20	87
21	89
22	90
23	95
24	99
25	105
26	119
27	120
28	121
29	128
30	131
31	139
32	143
33	145
34	169
35	177
36	179
37	181
38	183
39	193
40	195
41	201
42	203
43	204
44	211
45	215
46	217
47	218
48	219
49	221
50	225
51	227
52	233
53	247
54	248
55	255
56	273
57	275
58	288

n	a(n)
1	3
2	9
3	15
4	24
5	25
6	29
7	33
8	35
9	50
10	51
11	55
12	57
13	59
14	63
15	73
16	79
17	80
18	81
19	85
20	87
21	89
22	90
23	95
24	99
25	105
26	119
27	120
28	121
29	128
30	131
31	139
32	143
33	145
34	169
35	177
36	179
37	181
38	183
39	193
40	195
41	201
42	203
43	204
44	211
45	215
46	217
47	218
48	219
49	221
50	225
51	227
52	233
53	247
54	248
55	255
56	273
57	275
58	288

n	a(n)
1	3
2	9
3	15
4	24
5	25
6	29
7	33
8	35
9	50
10	51
11	55
12	57
13	59
14	63
15	73
16	79
17	80
18	81
19	85
20	87
21	89
22	90
23	95
24	99
25	105
26	119
27	120
28	121
29	128
30	131
31	139
32	143
33	145
34	169
35	177
36	179
37	181
38	183
39	193
40	195
41	201
42	203
43	204
44	211
45	215
46	217
47	218
48	219
49	221
50	225
51	227
52	233
53	247
54	248
55	255
56	273
57	275
58	288