A221220 - cp's OEIS frontend

A221220 Numbers with more than one prime factor such that concatenation of its prime factors (without multiplicity) is a prime.

n	a(n)
1	6
2	12
3	18
4	21
5	22
6	24
7	33
8	36
9	39
10	44
11	46
12	48
13	51
14	54
15	58
16	63
17	66
18	70
19	72
20	82
21	88
22	92
23	93
24	96
25	99
26	108
27	111
28	115
29	116
30	117
31	132
32	133
33	140
34	141
35	142
36	144
37	147
38	153
39	154
40	159
41	162
42	164
43	165
44	166
45	176
46	177
47	182
48	184
49	187
50	189
51	192
52	198
53	201
54	205
55	210
56	216
57	219

[6, 12, 18, 21, 22, 24, 33, 36, 39, 44, 46, 48, 51, 54, 58, 63, 66, 70, 72, 82, 88, 92, 93, 96, 99, 108, 111, 115, 116, 117, 132, 133, 140, 141, 142, 144, 147, 153, 154, 159, 162, 164, 165, 166, 176, 177, 182, 184, 187, 189, 192, 198, 201, 205, 210, 216, 219]

cp's OEIS Frontend

A221220 Numbers with more than one prime factor such that concatenation of its prime factors (without multiplicity) is a prime.

Table of values

List of values

n	a(n)
1	6
2	12
3	18
4	21
5	22
6	24
7	33
8	36
9	39
10	44
11	46
12	48
13	51
14	54
15	58
16	63
17	66
18	70
19	72
20	82
21	88
22	92
23	93
24	96
25	99
26	108
27	111
28	115
29	116
30	117
31	132
32	133
33	140
34	141
35	142
36	144
37	147
38	153
39	154
40	159
41	162
42	164
43	165
44	166
45	176
46	177
47	182
48	184
49	187
50	189
51	192
52	198
53	201
54	205
55	210
56	216
57	219

n	a(n)
1	6
2	12
3	18
4	21
5	22
6	24
7	33
8	36
9	39
10	44
11	46
12	48
13	51
14	54
15	58
16	63
17	66
18	70
19	72
20	82
21	88
22	92
23	93
24	96
25	99
26	108
27	111
28	115
29	116
30	117
31	132
32	133
33	140
34	141
35	142
36	144
37	147
38	153
39	154
40	159
41	162
42	164
43	165
44	166
45	176
46	177
47	182
48	184
49	187
50	189
51	192
52	198
53	201
54	205
55	210
56	216
57	219

n	a(n)
1	6
2	12
3	18
4	21
5	22
6	24
7	33
8	36
9	39
10	44
11	46
12	48
13	51
14	54
15	58
16	63
17	66
18	70
19	72
20	82
21	88
22	92
23	93
24	96
25	99
26	108
27	111
28	115
29	116
30	117
31	132
32	133
33	140
34	141
35	142
36	144
37	147
38	153
39	154
40	159
41	162
42	164
43	165
44	166
45	176
46	177
47	182
48	184
49	187
50	189
51	192
52	198
53	201
54	205
55	210
56	216
57	219