A361580 - cp's OEIS frontend

A361580 If n is composite, replace n with the concatenation of its nontrivial divisors, written in decreasing order, each divisor being written in base 10 with its digits in normal order, otherwise a(n) = n.

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	32
7	7
8	42
9	3
10	52
11	11
12	6432
13	13
14	72
15	53
16	842
17	17
18	9632
19	19
20	10542
21	73
22	112
23	23
24	1286432
25	5
26	132
27	93
28	14742
29	29
30	15106532
31	31
32	16842
33	113
34	172
35	75
36	181296432
37	37
38	192
39	133
40	20108542
41	41
42	21147632
43	43
44	221142
45	15953
46	232
47	47
48	24161286432
49	7
50	251052

[1, 2, 3, 2, 5, 32, 7, 42, 3, 52, 11, 6432, 13, 72, 53, 842, 17, 9632, 19, 10542, 73, 112, 23, 1286432, 5, 132, 93, 14742, 29, 15106532, 31, 16842, 113, 172, 75, 181296432, 37, 192, 133, 20108542, 41, 21147632, 43, 221142, 15953, 232, 47, 24161286432, 7, 251052]

cp's OEIS Frontend

A361580 If n is composite, replace n with the concatenation of its nontrivial divisors, written in decreasing order, each divisor being written in base 10 with its digits in normal order, otherwise a(n) = n.

Table of values

List of values