A109310 - cp's OEIS frontend

A109310 Numbers n such that difference between n-th and (n+1)-st semiprimes is a semiprime (sp).

n	a(n)
1	4
2	6
3	18
4	21
5	23
6	30
7	36
8	42
9	43
10	50
11	68
12	76
13	78
14	80
15	87
16	88
17	91
18	98
19	108
20	111
21	116
22	117
23	118
24	120
25	127
26	128
27	134
28	138
29	141
30	150
31	151
32	152
33	153
34	156
35	164
36	168
37	171
38	179
39	185
40	186
41	192
42	195
43	196
44	204
45	212
46	215
47	216
48	226
49	232
50	236
51	237
52	244
53	245
54	250
55	255
56	266

[4, 6, 18, 21, 23, 30, 36, 42, 43, 50, 68, 76, 78, 80, 87, 88, 91, 98, 108, 111, 116, 117, 118, 120, 127, 128, 134, 138, 141, 150, 151, 152, 153, 156, 164, 168, 171, 179, 185, 186, 192, 195, 196, 204, 212, 215, 216, 226, 232, 236, 237, 244, 245, 250, 255, 266]

cp's OEIS Frontend

A109310 Numbers n such that difference between n-th and (n+1)-st semiprimes is a semiprime (sp).

Table of values

List of values

n	a(n)
1	4
2	6
3	18
4	21
5	23
6	30
7	36
8	42
9	43
10	50
11	68
12	76
13	78
14	80
15	87
16	88
17	91
18	98
19	108
20	111
21	116
22	117
23	118
24	120
25	127
26	128
27	134
28	138
29	141
30	150
31	151
32	152
33	153
34	156
35	164
36	168
37	171
38	179
39	185
40	186
41	192
42	195
43	196
44	204
45	212
46	215
47	216
48	226
49	232
50	236
51	237
52	244
53	245
54	250
55	255
56	266

n	a(n)
1	4
2	6
3	18
4	21
5	23
6	30
7	36
8	42
9	43
10	50
11	68
12	76
13	78
14	80
15	87
16	88
17	91
18	98
19	108
20	111
21	116
22	117
23	118
24	120
25	127
26	128
27	134
28	138
29	141
30	150
31	151
32	152
33	153
34	156
35	164
36	168
37	171
38	179
39	185
40	186
41	192
42	195
43	196
44	204
45	212
46	215
47	216
48	226
49	232
50	236
51	237
52	244
53	245
54	250
55	255
56	266

n	a(n)
1	4
2	6
3	18
4	21
5	23
6	30
7	36
8	42
9	43
10	50
11	68
12	76
13	78
14	80
15	87
16	88
17	91
18	98
19	108
20	111
21	116
22	117
23	118
24	120
25	127
26	128
27	134
28	138
29	141
30	150
31	151
32	152
33	153
34	156
35	164
36	168
37	171
38	179
39	185
40	186
41	192
42	195
43	196
44	204
45	212
46	215
47	216
48	226
49	232
50	236
51	237
52	244
53	245
54	250
55	255
56	266