A073640 - cp's OEIS frontend

A073640 a(1) = 2; a(n) = smallest prime greater than the previous term such that concatenation of two successive terms is a prime.

n	a(n)
1	2
2	3
3	7
4	19
5	31
6	37
7	61
8	73
9	127
10	139
11	199
12	211
13	229
14	283
15	397
16	433
17	439
18	463
19	523
20	541
21	547
22	577
23	601
24	607
25	619
26	739
27	751
28	787
29	811
30	919
31	937
32	991
33	1009
34	1021
35	1039
36	1093
37	1201
38	1213
39	1297
40	1447
41	1453
42	1459
43	1471
44	1483
45	1657
46	1663
47	1723
48	1783
49	1867
50	1879

[2, 3, 7, 19, 31, 37, 61, 73, 127, 139, 199, 211, 229, 283, 397, 433, 439, 463, 523, 541, 547, 577, 601, 607, 619, 739, 751, 787, 811, 919, 937, 991, 1009, 1021, 1039, 1093, 1201, 1213, 1297, 1447, 1453, 1459, 1471, 1483, 1657, 1663, 1723, 1783, 1867, 1879]

cp's OEIS Frontend

A073640 a(1) = 2; a(n) = smallest prime greater than the previous term such that concatenation of two successive terms is a prime.

Table of values

List of values