A120687 - cp's OEIS frontend

A120687 Integers m such that the sequence defined by f(0)=m and f(n+1)=2+gpf(f(n)), with gpf(n) being the greatest prime factor of n (A006530), ends up in the period 3 cycle 7 -> 9 -> 5 -> 7 -> ...

n	a(n)
0	7
1	11
2	14
3	21
4	22
5	28
6	33
7	35
8	37
9	41
10	42
11	44
12	49
13	55
14	56
15	63
16	66
17	67
18	70
19	71
20	74
21	77
22	79
23	82
24	83
25	84
26	88
27	89
28	98
29	99
30	105
31	110
32	111
33	112
34	113
35	121
36	123
37	126
38	127
39	132
40	134
41	137
42	140
43	142
44	147
45	148
46	151
47	154
48	158
49	164
50	165
51	166
52	167
53	168
54	175
55	176
56	178
57	179
58	185
59	189

[7, 11, 14, 21, 22, 28, 33, 35, 37, 41, 42, 44, 49, 55, 56, 63, 66, 67, 70, 71, 74, 77, 79, 82, 83, 84, 88, 89, 98, 99, 105, 110, 111, 112, 113, 121, 123, 126, 127, 132, 134, 137, 140, 142, 147, 148, 151, 154, 158, 164, 165, 166, 167, 168, 175, 176, 178, 179, 185, 189]

cp's OEIS Frontend

A120687 Integers m such that the sequence defined by f(0)=m and f(n+1)=2+gpf(f(n)), with gpf(n) being the greatest prime factor of n (A006530), ends up in the period 3 cycle 7 -> 9 -> 5 -> 7 -> ...

Table of values

List of values

n	a(n)
0	7
1	11
2	14
3	21
4	22
5	28
6	33
7	35
8	37
9	41
10	42
11	44
12	49
13	55
14	56
15	63
16	66
17	67
18	70
19	71
20	74
21	77
22	79
23	82
24	83
25	84
26	88
27	89
28	98
29	99
30	105
31	110
32	111
33	112
34	113
35	121
36	123
37	126
38	127
39	132
40	134
41	137
42	140
43	142
44	147
45	148
46	151
47	154
48	158
49	164
50	165
51	166
52	167
53	168
54	175
55	176
56	178
57	179
58	185
59	189

n	a(n)
0	7
1	11
2	14
3	21
4	22
5	28
6	33
7	35
8	37
9	41
10	42
11	44
12	49
13	55
14	56
15	63
16	66
17	67
18	70
19	71
20	74
21	77
22	79
23	82
24	83
25	84
26	88
27	89
28	98
29	99
30	105
31	110
32	111
33	112
34	113
35	121
36	123
37	126
38	127
39	132
40	134
41	137
42	140
43	142
44	147
45	148
46	151
47	154
48	158
49	164
50	165
51	166
52	167
53	168
54	175
55	176
56	178
57	179
58	185
59	189

n	a(n)
0	7
1	11
2	14
3	21
4	22
5	28
6	33
7	35
8	37
9	41
10	42
11	44
12	49
13	55
14	56
15	63
16	66
17	67
18	70
19	71
20	74
21	77
22	79
23	82
24	83
25	84
26	88
27	89
28	98
29	99
30	105
31	110
32	111
33	112
34	113
35	121
36	123
37	126
38	127
39	132
40	134
41	137
42	140
43	142
44	147
45	148
46	151
47	154
48	158
49	164
50	165
51	166
52	167
53	168
54	175
55	176
56	178
57	179
58	185
59	189