A147616 - cp's OEIS frontend

A147616 Numbers k = concat(a,b) such that sigma(k) = sigma(a) * sigma(b), where sigma = A000203.

n	a(n)
1	38
2	58
3	66
4	87
5	118
6	178
7	205
8	217
9	275
10	295
11	298
12	395
13	451
14	478
15	492
16	517
17	538
18	575
19	660
20	718
21	766
22	775
23	838
24	839
25	870
26	898
27	1018
28	1138
29	1175
30	1195
31	1318
32	1671
33	1678
34	1775
35	1795
36	1975
37	2050
38	2163
39	2170
40	2295
41	2395
42	2518
43	2578
44	2638
45	2665
46	2750
47	2818

[38, 58, 66, 87, 118, 178, 205, 217, 275, 295, 298, 395, 451, 478, 492, 517, 538, 575, 660, 718, 766, 775, 838, 839, 870, 898, 1018, 1138, 1175, 1195, 1318, 1671, 1678, 1775, 1795, 1975, 2050, 2163, 2170, 2295, 2395, 2518, 2578, 2638, 2665, 2750, 2818]

cp's OEIS Frontend

A147616 Numbers k = concat(a,b) such that sigma(k) = sigma(a) * sigma(b), where sigma = A000203.

Table of values

List of values