A372308 - cp's OEIS frontend

A372308 Composite numbers k such that the digits of k are in nonincreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nondecreasing order.

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	20
7	21
8	30
9	32
10	40
11	42
12	50
13	54
14	60
15	63
16	64
17	70
18	72
19	74
20	75
21	80
22	81
23	84
24	90
25	92
26	94
27	96
28	98
29	100
30	111
31	200
32	210
33	222
34	300
35	320
36	333
37	400
38	420
39	432
40	441
41	444
42	500
43	531
44	540
45	553
46	554
47	600
48	611
49	630
50	632
51	640
52	666
53	700
54	711
55	720
56	750
57	752
58	800
59	810
60	840
61	851
62	864
63	871
64	875
65	882

[4, 6, 8, 9, 10, 20, 21, 30, 32, 40, 42, 50, 54, 60, 63, 64, 70, 72, 74, 75, 80, 81, 84, 90, 92, 94, 96, 98, 100, 111, 200, 210, 222, 300, 320, 333, 400, 420, 432, 441, 444, 500, 531, 540, 553, 554, 600, 611, 630, 632, 640, 666, 700, 711, 720, 750, 752, 800, 810, 840, 851, 864, 871, 875, 882]

cp's OEIS Frontend

A372308 Composite numbers k such that the digits of k are in nonincreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nondecreasing order.

Table of values

List of values

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	20
7	21
8	30
9	32
10	40
11	42
12	50
13	54
14	60
15	63
16	64
17	70
18	72
19	74
20	75
21	80
22	81
23	84
24	90
25	92
26	94
27	96
28	98
29	100
30	111
31	200
32	210
33	222
34	300
35	320
36	333
37	400
38	420
39	432
40	441
41	444
42	500
43	531
44	540
45	553
46	554
47	600
48	611
49	630
50	632
51	640
52	666
53	700
54	711
55	720
56	750
57	752
58	800
59	810
60	840
61	851
62	864
63	871
64	875
65	882

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	20
7	21
8	30
9	32
10	40
11	42
12	50
13	54
14	60
15	63
16	64
17	70
18	72
19	74
20	75
21	80
22	81
23	84
24	90
25	92
26	94
27	96
28	98
29	100
30	111
31	200
32	210
33	222
34	300
35	320
36	333
37	400
38	420
39	432
40	441
41	444
42	500
43	531
44	540
45	553
46	554
47	600
48	611
49	630
50	632
51	640
52	666
53	700
54	711
55	720
56	750
57	752
58	800
59	810
60	840
61	851
62	864
63	871
64	875
65	882

n	a(n)
1	4
2	6
3	8
4	9
5	10
6	20
7	21
8	30
9	32
10	40
11	42
12	50
13	54
14	60
15	63
16	64
17	70
18	72
19	74
20	75
21	80
22	81
23	84
24	90
25	92
26	94
27	96
28	98
29	100
30	111
31	200
32	210
33	222
34	300
35	320
36	333
37	400
38	420
39	432
40	441
41	444
42	500
43	531
44	540
45	553
46	554
47	600
48	611
49	630
50	632
51	640
52	666
53	700
54	711
55	720
56	750
57	752
58	800
59	810
60	840
61	851
62	864
63	871
64	875
65	882