A217263 - cp's OEIS frontend

A217263 Composite numbers such that every concatenation of their prime factors is prime.

n	a(n)
1	21
2	33
3	51
4	63
5	93
6	111
7	133
8	177
9	201
10	219
11	247
12	253
13	327
14	411
15	427
16	549
17	573
18	589
19	657
20	679
21	687
22	763
23	793
24	813
25	833
26	889
27	993
28	1077
29	1081
30	1119
31	1127
32	1243
33	1339
34	1347
35	1401
36	1411
37	1497
38	1501
39	1603
40	1623
41	1651
42	1671
43	1821
44	1839
45	1843
46	1851
47	1981
48	2009
49	2019

[21, 33, 51, 63, 93, 111, 133, 177, 201, 219, 247, 253, 327, 411, 427, 549, 573, 589, 657, 679, 687, 763, 793, 813, 833, 889, 993, 1077, 1081, 1119, 1127, 1243, 1339, 1347, 1401, 1411, 1497, 1501, 1603, 1623, 1651, 1671, 1821, 1839, 1843, 1851, 1981, 2009, 2019]

cp's OEIS Frontend

A217263 Composite numbers such that every concatenation of their prime factors is prime.

Table of values

List of values