A331116 - cp's OEIS frontend

A331116 Inserting a digit '1' between the first two adjacent digits of k, then inserting a digit '2' between the two following adjacent digits of k, ..., then inserting the integer '10' between the tenth and the eleventh digits of k, ... produces a prime number.

n	a(n)
1	13
2	21
3	31
4	33
5	37
6	49
7	63
8	67
9	69
10	79
11	81
12	91
13	99
14	107
15	131
16	139
17	143
18	157
19	161
20	181
21	187
22	193
23	197
24	203
25	211
26	221
27	227
28	233
29	251
30	253
31	259
32	277
33	281
34	299
35	311
36	313
37	323
38	331
39	337
40	367
41	371
42	373
43	377
44	379
45	403
46	421
47	427
48	451
49	461
50	467
51	479

[13, 21, 31, 33, 37, 49, 63, 67, 69, 79, 81, 91, 99, 107, 131, 139, 143, 157, 161, 181, 187, 193, 197, 203, 211, 221, 227, 233, 251, 253, 259, 277, 281, 299, 311, 313, 323, 331, 337, 367, 371, 373, 377, 379, 403, 421, 427, 451, 461, 467, 479]

cp's OEIS Frontend

A331116 Inserting a digit '1' between the first two adjacent digits of k, then inserting a digit '2' between the two following adjacent digits of k, ..., then inserting the integer '10' between the tenth and the eleventh digits of k, ... produces a prime number.

Table of values

List of values

n	a(n)
1	13
2	21
3	31
4	33
5	37
6	49
7	63
8	67
9	69
10	79
11	81
12	91
13	99
14	107
15	131
16	139
17	143
18	157
19	161
20	181
21	187
22	193
23	197
24	203
25	211
26	221
27	227
28	233
29	251
30	253
31	259
32	277
33	281
34	299
35	311
36	313
37	323
38	331
39	337
40	367
41	371
42	373
43	377
44	379
45	403
46	421
47	427
48	451
49	461
50	467
51	479

n	a(n)
1	13
2	21
3	31
4	33
5	37
6	49
7	63
8	67
9	69
10	79
11	81
12	91
13	99
14	107
15	131
16	139
17	143
18	157
19	161
20	181
21	187
22	193
23	197
24	203
25	211
26	221
27	227
28	233
29	251
30	253
31	259
32	277
33	281
34	299
35	311
36	313
37	323
38	331
39	337
40	367
41	371
42	373
43	377
44	379
45	403
46	421
47	427
48	451
49	461
50	467
51	479

n	a(n)
1	13
2	21
3	31
4	33
5	37
6	49
7	63
8	67
9	69
10	79
11	81
12	91
13	99
14	107
15	131
16	139
17	143
18	157
19	161
20	181
21	187
22	193
23	197
24	203
25	211
26	221
27	227
28	233
29	251
30	253
31	259
32	277
33	281
34	299
35	311
36	313
37	323
38	331
39	337
40	367
41	371
42	373
43	377
44	379
45	403
46	421
47	427
48	451
49	461
50	467
51	479