A094043 - cp's OEIS frontend

A094043 Alternate composite and prime numbers not included earlier such that every partial concatenation is a prime: a(2n) is prime and a(2n-1) is not prime.

n	a(n)
1	1
2	3
3	9
4	13
5	63
6	107
7	27
8	67
9	39
10	23
11	49
12	29
13	99
14	439
15	207
16	41
17	357
18	229
19	77
20	139
21	69
22	839
23	133
24	239
25	121
26	317
27	187
28	53
29	33
30	1291
31	177
32	557
33	171
34	1753
35	323
36	19
37	519
38	953
39	231
40	523
41	321
42	251
43	327
44	31
45	299
46	2203
47	747
48	101
49	81
50	1741
51	291
52	6779
53	261
54	1549
55	1463
56	97
57	297

[1, 3, 9, 13, 63, 107, 27, 67, 39, 23, 49, 29, 99, 439, 207, 41, 357, 229, 77, 139, 69, 839, 133, 239, 121, 317, 187, 53, 33, 1291, 177, 557, 171, 1753, 323, 19, 519, 953, 231, 523, 321, 251, 327, 31, 299, 2203, 747, 101, 81, 1741, 291, 6779, 261, 1549, 1463, 97, 297]

cp's OEIS Frontend

A094043 Alternate composite and prime numbers not included earlier such that every partial concatenation is a prime: a(2n) is prime and a(2n-1) is not prime.

Table of values

List of values