A298268 - cp's OEIS frontend

A298268 a(1) = 1, and for any n > 1, if n is the k-th number with greatest prime factor p, then a(n) is the k-th number with least prime factor p.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	7
8	6
9	15
10	25
11	11
12	21
13	13
14	49
15	35
16	8
17	17
18	27
19	19
20	55
21	77
22	121
23	23
24	33
25	65
26	169
27	39
28	91
29	29
30	85
31	31
32	10
33	143
34	289
35	119
36	45
37	37
38	361
39	221
40	95
41	41
42	133
43	43
44	187
45	115
46	529
47	47
48	51
49	161
50	125
51	323
52	247
53	53
54	57
55	209
56	203
57	437
58	841
59	59
60	145
61	61
62	961

[1, 2, 3, 4, 5, 9, 7, 6, 15, 25, 11, 21, 13, 49, 35, 8, 17, 27, 19, 55, 77, 121, 23, 33, 65, 169, 39, 91, 29, 85, 31, 10, 143, 289, 119, 45, 37, 361, 221, 95, 41, 133, 43, 187, 115, 529, 47, 51, 161, 125, 323, 247, 53, 57, 209, 203, 437, 841, 59, 145, 61, 961]

cp's OEIS Frontend

A298268 a(1) = 1, and for any n > 1, if n is the k-th number with greatest prime factor p, then a(n) is the k-th number with least prime factor p.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	7
8	6
9	15
10	25
11	11
12	21
13	13
14	49
15	35
16	8
17	17
18	27
19	19
20	55
21	77
22	121
23	23
24	33
25	65
26	169
27	39
28	91
29	29
30	85
31	31
32	10
33	143
34	289
35	119
36	45
37	37
38	361
39	221
40	95
41	41
42	133
43	43
44	187
45	115
46	529
47	47
48	51
49	161
50	125
51	323
52	247
53	53
54	57
55	209
56	203
57	437
58	841
59	59
60	145
61	61
62	961

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	7
8	6
9	15
10	25
11	11
12	21
13	13
14	49
15	35
16	8
17	17
18	27
19	19
20	55
21	77
22	121
23	23
24	33
25	65
26	169
27	39
28	91
29	29
30	85
31	31
32	10
33	143
34	289
35	119
36	45
37	37
38	361
39	221
40	95
41	41
42	133
43	43
44	187
45	115
46	529
47	47
48	51
49	161
50	125
51	323
52	247
53	53
54	57
55	209
56	203
57	437
58	841
59	59
60	145
61	61
62	961

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	9
7	7
8	6
9	15
10	25
11	11
12	21
13	13
14	49
15	35
16	8
17	17
18	27
19	19
20	55
21	77
22	121
23	23
24	33
25	65
26	169
27	39
28	91
29	29
30	85
31	31
32	10
33	143
34	289
35	119
36	45
37	37
38	361
39	221
40	95
41	41
42	133
43	43
44	187
45	115
46	529
47	47
48	51
49	161
50	125
51	323
52	247
53	53
54	57
55	209
56	203
57	437
58	841
59	59
60	145
61	61
62	961