A120712 - cp's OEIS frontend

A120712 Numbers k with the property that the concatenation of the nontrivial divisors of k (i.e., excluding 1 and k) is a prime.

n	a(n)
1	4
2	6
3	9
4	21
5	22
6	25
7	33
8	39
9	46
10	49
11	51
12	54
13	58
14	78
15	82
16	93
17	99
18	111
19	115
20	121
21	133
22	141
23	142
24	147
25	153
26	154
27	159
28	162
29	166
30	169
31	174
32	177
33	186
34	187
35	189
36	201
37	205
38	219
39	226
40	235
41	237
42	247
43	249
44	253
45	262
46	267
47	274
48	286
49	289
50	291
51	294
52	301
53	318

[4, 6, 9, 21, 22, 25, 33, 39, 46, 49, 51, 54, 58, 78, 82, 93, 99, 111, 115, 121, 133, 141, 142, 147, 153, 154, 159, 162, 166, 169, 174, 177, 186, 187, 189, 201, 205, 219, 226, 235, 237, 247, 249, 253, 262, 267, 274, 286, 289, 291, 294, 301, 318]

cp's OEIS Frontend

A120712 Numbers k with the property that the concatenation of the nontrivial divisors of k (i.e., excluding 1 and k) is a prime.

Table of values

List of values

n	a(n)
1	4
2	6
3	9
4	21
5	22
6	25
7	33
8	39
9	46
10	49
11	51
12	54
13	58
14	78
15	82
16	93
17	99
18	111
19	115
20	121
21	133
22	141
23	142
24	147
25	153
26	154
27	159
28	162
29	166
30	169
31	174
32	177
33	186
34	187
35	189
36	201
37	205
38	219
39	226
40	235
41	237
42	247
43	249
44	253
45	262
46	267
47	274
48	286
49	289
50	291
51	294
52	301
53	318

n	a(n)
1	4
2	6
3	9
4	21
5	22
6	25
7	33
8	39
9	46
10	49
11	51
12	54
13	58
14	78
15	82
16	93
17	99
18	111
19	115
20	121
21	133
22	141
23	142
24	147
25	153
26	154
27	159
28	162
29	166
30	169
31	174
32	177
33	186
34	187
35	189
36	201
37	205
38	219
39	226
40	235
41	237
42	247
43	249
44	253
45	262
46	267
47	274
48	286
49	289
50	291
51	294
52	301
53	318

n	a(n)
1	4
2	6
3	9
4	21
5	22
6	25
7	33
8	39
9	46
10	49
11	51
12	54
13	58
14	78
15	82
16	93
17	99
18	111
19	115
20	121
21	133
22	141
23	142
24	147
25	153
26	154
27	159
28	162
29	166
30	169
31	174
32	177
33	186
34	187
35	189
36	201
37	205
38	219
39	226
40	235
41	237
42	247
43	249
44	253
45	262
46	267
47	274
48	286
49	289
50	291
51	294
52	301
53	318