A080155 - cp's OEIS frontend

A080155 a(1)=2; a(n) for n>1 is the smallest prime number > a(n-1) such that the concatenation of all previous terms is also prime.

n	a(n)
1	2
2	3
3	11
4	31
5	47
6	229
7	251
8	577
9	857
10	859
11	911
12	1123
13	1223
14	1297
15	1571
16	2161
17	2417
18	2551
19	2879
20	3319
21	5273
22	6121
23	6947
24	7603
25	8273
26	12721
27	12953
28	13291
29	15683
30	16453
31	17207
32	18133
33	20399
34	23743
35	23909
36	25849
37	28277
38	28879
39	35291
40	35461
41	36107
42	43573

[2, 3, 11, 31, 47, 229, 251, 577, 857, 859, 911, 1123, 1223, 1297, 1571, 2161, 2417, 2551, 2879, 3319, 5273, 6121, 6947, 7603, 8273, 12721, 12953, 13291, 15683, 16453, 17207, 18133, 20399, 23743, 23909, 25849, 28277, 28879, 35291, 35461, 36107, 43573]

cp's OEIS Frontend

A080155 a(1)=2; a(n) for n>1 is the smallest prime number > a(n-1) such that the concatenation of all previous terms is also prime.

Table of values

List of values