A069867 - cp's OEIS frontend

A069867 Primes in which repeatedly deleting the least significant digit then the most significant digit gives a prime at every step until a single-digit prime remains.

n	a(n)
1	2
2	3
3	5
4	7
5	23
6	29
7	31
8	37
9	53
10	59
11	71
12	73
13	79
14	131
15	137
16	139
17	173
18	179
19	233
20	239
21	373
22	379
23	431
24	433
25	439
26	479
27	673
28	677
29	733
30	739
31	839
32	971
33	977
34	1319
35	1373
36	1733
37	2237
38	2239
39	2293
40	2297
41	2711
42	2713
43	2719
44	3313
45	3319
46	3371
47	3373
48	3533
49	3539
50	3593
51	3733

[2, 3, 5, 7, 23, 29, 31, 37, 53, 59, 71, 73, 79, 131, 137, 139, 173, 179, 233, 239, 373, 379, 431, 433, 439, 479, 673, 677, 733, 739, 839, 971, 977, 1319, 1373, 1733, 2237, 2239, 2293, 2297, 2711, 2713, 2719, 3313, 3319, 3371, 3373, 3533, 3539, 3593, 3733]

cp's OEIS Frontend

A069867 Primes in which repeatedly deleting the least significant digit then the most significant digit gives a prime at every step until a single-digit prime remains.

Table of values

List of values