A077390 - cp's OEIS frontend

A077390 Primes which leave primes at every step if most significant digit and least significant digit are deleted until a one digit or two digit prime is obtained.

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	127
27	131
28	137
29	139
30	151
31	157
32	173
33	179
34	223
35	227
36	229
37	233
38	239
39	251
40	257
41	271
42	277
43	331
44	337
45	353
46	359
47	373
48	379
49	421
50	431
51	433
52	439
53	457
54	479
55	521
56	523
57	557
58	571
59	577
60	631
61	653
62	659

[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 127, 131, 137, 139, 151, 157, 173, 179, 223, 227, 229, 233, 239, 251, 257, 271, 277, 331, 337, 353, 359, 373, 379, 421, 431, 433, 439, 457, 479, 521, 523, 557, 571, 577, 631, 653, 659]

cp's OEIS Frontend

A077390 Primes which leave primes at every step if most significant digit and least significant digit are deleted until a one digit or two digit prime is obtained.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	127
27	131
28	137
29	139
30	151
31	157
32	173
33	179
34	223
35	227
36	229
37	233
38	239
39	251
40	257
41	271
42	277
43	331
44	337
45	353
46	359
47	373
48	379
49	421
50	431
51	433
52	439
53	457
54	479
55	521
56	523
57	557
58	571
59	577
60	631
61	653
62	659

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	127
27	131
28	137
29	139
30	151
31	157
32	173
33	179
34	223
35	227
36	229
37	233
38	239
39	251
40	257
41	271
42	277
43	331
44	337
45	353
46	359
47	373
48	379
49	421
50	431
51	433
52	439
53	457
54	479
55	521
56	523
57	557
58	571
59	577
60	631
61	653
62	659

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	17
8	19
9	23
10	29
11	31
12	37
13	41
14	43
15	47
16	53
17	59
18	61
19	67
20	71
21	73
22	79
23	83
24	89
25	97
26	127
27	131
28	137
29	139
30	151
31	157
32	173
33	179
34	223
35	227
36	229
37	233
38	239
39	251
40	257
41	271
42	277
43	331
44	337
45	353
46	359
47	373
48	379
49	421
50	431
51	433
52	439
53	457
54	479
55	521
56	523
57	557
58	571
59	577
60	631
61	653
62	659