A130904 - cp's OEIS frontend

A130904 Numbers n such that the trajectory of the map n -> (n + lpf(n)) / 2 reaches 3, where lpf(n) is the least prime factor of n (A020639).

n	a(n)
1	3
2	4
3	6
4	9
5	10
6	15
7	16
8	18
9	25
10	27
11	28
12	30
13	33
14	34
15	48
16	49
17	51
18	52
19	54
20	55
21	57
22	58
23	63
24	64
25	66
26	91
27	93
28	94
29	96
30	99
31	100
32	102
33	105
34	106
35	108
36	111
37	112
38	114
39	119
40	121
41	123
42	124
43	126
44	129
45	130
46	169
47	180
48	183
49	184
50	186
51	187
52	189
53	190
54	195
55	196
56	198

[3, 4, 6, 9, 10, 15, 16, 18, 25, 27, 28, 30, 33, 34, 48, 49, 51, 52, 54, 55, 57, 58, 63, 64, 66, 91, 93, 94, 96, 99, 100, 102, 105, 106, 108, 111, 112, 114, 119, 121, 123, 124, 126, 129, 130, 169, 180, 183, 184, 186, 187, 189, 190, 195, 196, 198]

cp's OEIS Frontend

A130904 Numbers n such that the trajectory of the map n -> (n + lpf(n)) / 2 reaches 3, where lpf(n) is the least prime factor of n (A020639).

Table of values

List of values

n	a(n)
1	3
2	4
3	6
4	9
5	10
6	15
7	16
8	18
9	25
10	27
11	28
12	30
13	33
14	34
15	48
16	49
17	51
18	52
19	54
20	55
21	57
22	58
23	63
24	64
25	66
26	91
27	93
28	94
29	96
30	99
31	100
32	102
33	105
34	106
35	108
36	111
37	112
38	114
39	119
40	121
41	123
42	124
43	126
44	129
45	130
46	169
47	180
48	183
49	184
50	186
51	187
52	189
53	190
54	195
55	196
56	198

n	a(n)
1	3
2	4
3	6
4	9
5	10
6	15
7	16
8	18
9	25
10	27
11	28
12	30
13	33
14	34
15	48
16	49
17	51
18	52
19	54
20	55
21	57
22	58
23	63
24	64
25	66
26	91
27	93
28	94
29	96
30	99
31	100
32	102
33	105
34	106
35	108
36	111
37	112
38	114
39	119
40	121
41	123
42	124
43	126
44	129
45	130
46	169
47	180
48	183
49	184
50	186
51	187
52	189
53	190
54	195
55	196
56	198

n	a(n)
1	3
2	4
3	6
4	9
5	10
6	15
7	16
8	18
9	25
10	27
11	28
12	30
13	33
14	34
15	48
16	49
17	51
18	52
19	54
20	55
21	57
22	58
23	63
24	64
25	66
26	91
27	93
28	94
29	96
30	99
31	100
32	102
33	105
34	106
35	108
36	111
37	112
38	114
39	119
40	121
41	123
42	124
43	126
44	129
45	130
46	169
47	180
48	183
49	184
50	186
51	187
52	189
53	190
54	195
55	196
56	198