A103607 - cp's OEIS frontend

A103607 Write down the semiprimes but omit any semiprime (such as 46 or 69) that is the concatenation of consecutive semiprimes.

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	21
8	22
9	25
10	26
11	33
12	34
13	35
14	38
15	39
16	49
17	51
18	55
19	57
20	58
21	62
22	65
23	74
24	77
25	82
26	85
27	86
28	87
29	91
30	93
31	94
32	95
33	106
34	111
35	115
36	118
37	119
38	121
39	122
40	123
41	129
42	133
43	134
44	141
45	142
46	143
47	145
48	146
49	155
50	158
51	159
52	161
53	166
54	169
55	177
56	178
57	183
58	185
59	187

[4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 49, 51, 55, 57, 58, 62, 65, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 169, 177, 178, 183, 185, 187]

cp's OEIS Frontend

A103607 Write down the semiprimes but omit any semiprime (such as 46 or 69) that is the concatenation of consecutive semiprimes.

Table of values

List of values

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	21
8	22
9	25
10	26
11	33
12	34
13	35
14	38
15	39
16	49
17	51
18	55
19	57
20	58
21	62
22	65
23	74
24	77
25	82
26	85
27	86
28	87
29	91
30	93
31	94
32	95
33	106
34	111
35	115
36	118
37	119
38	121
39	122
40	123
41	129
42	133
43	134
44	141
45	142
46	143
47	145
48	146
49	155
50	158
51	159
52	161
53	166
54	169
55	177
56	178
57	183
58	185
59	187

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	21
8	22
9	25
10	26
11	33
12	34
13	35
14	38
15	39
16	49
17	51
18	55
19	57
20	58
21	62
22	65
23	74
24	77
25	82
26	85
27	86
28	87
29	91
30	93
31	94
32	95
33	106
34	111
35	115
36	118
37	119
38	121
39	122
40	123
41	129
42	133
43	134
44	141
45	142
46	143
47	145
48	146
49	155
50	158
51	159
52	161
53	166
54	169
55	177
56	178
57	183
58	185
59	187

n	a(n)
1	4
2	6
3	9
4	10
5	14
6	15
7	21
8	22
9	25
10	26
11	33
12	34
13	35
14	38
15	39
16	49
17	51
18	55
19	57
20	58
21	62
22	65
23	74
24	77
25	82
26	85
27	86
28	87
29	91
30	93
31	94
32	95
33	106
34	111
35	115
36	118
37	119
38	121
39	122
40	123
41	129
42	133
43	134
44	141
45	142
46	143
47	145
48	146
49	155
50	158
51	159
52	161
53	166
54	169
55	177
56	178
57	183
58	185
59	187