A159836 - cp's OEIS frontend

A159836 Integers n such that the orbit n, f(n), f(f(n)), ... is eventually periodic with period 2, where f(n) = product(a(k)^p(k)) when n has the prime factorization n = product(p(k)^a(k)).

n	a(n)
1	8
2	9
3	18
4	24
5	25
6	32
7	36
8	40
9	45
10	49
11	50
12	56
13	63
14	64
15	75
16	81
17	88
18	90
19	96
20	98
21	99
22	100
23	104
24	117
25	120
26	121
27	125
28	126
29	128
30	136
31	144
32	147
33	150
34	152
35	153
36	160
37	162
38	168
39	169
40	171
41	175
42	180
43	184
44	192
45	196
46	198
47	200
48	207
49	216
50	224
51	225
52	232
53	234
54	242
55	243
56	245
57	248

[8, 9, 18, 24, 25, 32, 36, 40, 45, 49, 50, 56, 63, 64, 75, 81, 88, 90, 96, 98, 99, 100, 104, 117, 120, 121, 125, 126, 128, 136, 144, 147, 150, 152, 153, 160, 162, 168, 169, 171, 175, 180, 184, 192, 196, 198, 200, 207, 216, 224, 225, 232, 234, 242, 243, 245, 248]

cp's OEIS Frontend

A159836 Integers n such that the orbit n, f(n), f(f(n)), ... is eventually periodic with period 2, where f(n) = product(a(k)^p(k)) when n has the prime factorization n = product(p(k)^a(k)).

Table of values

List of values

n	a(n)
1	8
2	9
3	18
4	24
5	25
6	32
7	36
8	40
9	45
10	49
11	50
12	56
13	63
14	64
15	75
16	81
17	88
18	90
19	96
20	98
21	99
22	100
23	104
24	117
25	120
26	121
27	125
28	126
29	128
30	136
31	144
32	147
33	150
34	152
35	153
36	160
37	162
38	168
39	169
40	171
41	175
42	180
43	184
44	192
45	196
46	198
47	200
48	207
49	216
50	224
51	225
52	232
53	234
54	242
55	243
56	245
57	248

n	a(n)
1	8
2	9
3	18
4	24
5	25
6	32
7	36
8	40
9	45
10	49
11	50
12	56
13	63
14	64
15	75
16	81
17	88
18	90
19	96
20	98
21	99
22	100
23	104
24	117
25	120
26	121
27	125
28	126
29	128
30	136
31	144
32	147
33	150
34	152
35	153
36	160
37	162
38	168
39	169
40	171
41	175
42	180
43	184
44	192
45	196
46	198
47	200
48	207
49	216
50	224
51	225
52	232
53	234
54	242
55	243
56	245
57	248

n	a(n)
1	8
2	9
3	18
4	24
5	25
6	32
7	36
8	40
9	45
10	49
11	50
12	56
13	63
14	64
15	75
16	81
17	88
18	90
19	96
20	98
21	99
22	100
23	104
24	117
25	120
26	121
27	125
28	126
29	128
30	136
31	144
32	147
33	150
34	152
35	153
36	160
37	162
38	168
39	169
40	171
41	175
42	180
43	184
44	192
45	196
46	198
47	200
48	207
49	216
50	224
51	225
52	232
53	234
54	242
55	243
56	245
57	248