A372280 - cp's OEIS frontend

A372280 Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order.

n	a(n)
1	4
2	8
3	9
4	16
5	22
6	25
7	27
8	33
9	44
10	49
11	55
12	77
13	88
14	99
15	125
16	128
17	155
18	256
19	279
20	1477
21	1555
22	1688
23	1899
24	2799
25	3479
26	3577
27	14777
28	16888
29	18999
30	22599
31	36799
32	444577
33	455777
34	1112447
35	1555555
36	2555555
37	2799999
38	3577777
39	3799999
40	45577777
41	124556677
42	155555555555
43	279999999999

[4, 8, 9, 16, 22, 25, 27, 33, 44, 49, 55, 77, 88, 99, 125, 128, 155, 256, 279, 1477, 1555, 1688, 1899, 2799, 3479, 3577, 14777, 16888, 18999, 22599, 36799, 444577, 455777, 1112447, 1555555, 2555555, 2799999, 3577777, 3799999, 45577777, 124556677, 155555555555, 279999999999]

cp's OEIS Frontend

A372280 Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order.

Table of values

List of values