A074721 - cp's OEIS frontend

A074721 Concatenate the primes as 2357111317192329313..., then insert commas from left to right so that between each pair of successive commas is a prime, always making the new prime as small as possible.

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	2
10	3
11	2
12	93137414347535961677173798389971011031071091131
13	2
14	7
15	13
16	11
17	3
18	7
19	13
20	91491511
21	5
22	7
23	163
24	167
25	17
26	3
27	17
28	9181
29	19
30	11
31	9319
32	7
33	19
34	9211223227229233239241251257
35	2
36	6326927
37	127
38	7
39	2
40	81283
41	2
42	93307
43	3
44	11
45	3
46	13
47	3
48	17
49	3
50	3
51	13
52	3
53	7
54	3
55	47
56	3
57	493533593673733

[2, 3, 5, 7, 11, 13, 17, 19, 2, 3, 2, 93137414347535961677173798389971011031071091131, 2, 7, 13, 11, 3, 7, 13, 91491511, 5, 7, 163, 167, 17, 3, 17, 9181, 19, 11, 9319, 7, 19, 9211223227229233239241251257, 2, 6326927, 127, 7, 2, 81283, 2, 93307, 3, 11, 3, 13, 3, 17, 3, 3, 13, 3, 7, 3, 47, 3, 493533593673733]

cp's OEIS Frontend

A074721 Concatenate the primes as 2357111317192329313..., then insert commas from left to right so that between each pair of successive commas is a prime, always making the new prime as small as possible.

Table of values

List of values