A175349 - cp's OEIS frontend

A175349 a(n) is the smallest positive integer that, when written in binary, contains the binary representations of both the n-th prime and the n-th composite as (possibly overlapping) substrings.

n	a(n)
1	4
2	6
3	40
4	39
5	43
6	108
7	113
8	79
9	368
10	466
11	500
12	149
13	361
14	344
15	377
16	53
17	59
18	988
19	542
20	2272
21	2121
22	1103
23	2259
24	356
25	609
26	1253
27	3304
28	3434
29	876
30	2929
31	4078
32	387
33	393
34	2226
35	4787
36	1687
37	630
38	2615
39	1336
40	5561
41	2874
42	5820
43	382
44	4033
45	12608
46	8391
47	13506
48	14276
49	8931
50	14662

[4, 6, 40, 39, 43, 108, 113, 79, 368, 466, 500, 149, 361, 344, 377, 53, 59, 988, 542, 2272, 2121, 1103, 2259, 356, 609, 1253, 3304, 3434, 876, 2929, 4078, 387, 393, 2226, 4787, 1687, 630, 2615, 1336, 5561, 2874, 5820, 382, 4033, 12608, 8391, 13506, 14276, 8931, 14662]

cp's OEIS Frontend

A175349 a(n) is the smallest positive integer that, when written in binary, contains the binary representations of both the n-th prime and the n-th composite as (possibly overlapping) substrings.

Table of values

List of values