A088614 - cp's OEIS frontend

A088614 Alternate prime and composite numbers not included earlier such that every partial concatenation is a prime: a(2n) is composite and a(2n-1) is prime.

n	a(n)
1	2
2	9
3	3
4	27
5	11
6	51
7	13
8	33
9	41
10	93
11	31
12	99
13	29
14	63
15	1117
16	441
17	503
18	303
19	163
20	171
21	59
22	357
23	67
24	219
25	113
26	417
27	691
28	729
29	239
30	511
31	227
32	393
33	211
34	189
35	3797
36	291
37	1789
38	549
39	419
40	501
41	103
42	81
43	3257
44	39
45	727
46	531
47	617
48	69
49	6883
50	387
51	521
52	153
53	1237
54	287
55	3391
56	927

[2, 9, 3, 27, 11, 51, 13, 33, 41, 93, 31, 99, 29, 63, 1117, 441, 503, 303, 163, 171, 59, 357, 67, 219, 113, 417, 691, 729, 239, 511, 227, 393, 211, 189, 3797, 291, 1789, 549, 419, 501, 103, 81, 3257, 39, 727, 531, 617, 69, 6883, 387, 521, 153, 1237, 287, 3391, 927]

cp's OEIS Frontend

A088614 Alternate prime and composite numbers not included earlier such that every partial concatenation is a prime: a(2n) is composite and a(2n-1) is prime.

Table of values

List of values