A109403 - cp's OEIS frontend

A109403 Examine the sequence of all (even or odd) semiprimes, A001358, and record the averages of any pair of successive terms of the same parity.

n	a(n)
1	5
2	12
3	18
4	50
5	53
6	56
7	60
8	67
9	89
10	92
11	113
12	120
13	126
14	131
15	144
16	160
17	173
18	184
19	186
20	204
21	211
22	216
23	220
24	236
25	242
26	248
27	251
28	266
29	276
30	288
31	290
32	293
33	300
34	304
35	307
36	320
37	322
38	328
39	337
40	340
41	368
42	374
43	379
44	384
45	392

[5, 12, 18, 50, 53, 56, 60, 67, 89, 92, 113, 120, 126, 131, 144, 160, 173, 184, 186, 204, 211, 216, 220, 236, 242, 248, 251, 266, 276, 288, 290, 293, 300, 304, 307, 320, 322, 328, 337, 340, 368, 374, 379, 384, 392]

cp's OEIS Frontend

A109403 Examine the sequence of all (even or odd) semiprimes, A001358, and record the averages of any pair of successive terms of the same parity.

Table of values

List of values

n	a(n)
1	5
2	12
3	18
4	50
5	53
6	56
7	60
8	67
9	89
10	92
11	113
12	120
13	126
14	131
15	144
16	160
17	173
18	184
19	186
20	204
21	211
22	216
23	220
24	236
25	242
26	248
27	251
28	266
29	276
30	288
31	290
32	293
33	300
34	304
35	307
36	320
37	322
38	328
39	337
40	340
41	368
42	374
43	379
44	384
45	392

n	a(n)
1	5
2	12
3	18
4	50
5	53
6	56
7	60
8	67
9	89
10	92
11	113
12	120
13	126
14	131
15	144
16	160
17	173
18	184
19	186
20	204
21	211
22	216
23	220
24	236
25	242
26	248
27	251
28	266
29	276
30	288
31	290
32	293
33	300
34	304
35	307
36	320
37	322
38	328
39	337
40	340
41	368
42	374
43	379
44	384
45	392

n	a(n)
1	5
2	12
3	18
4	50
5	53
6	56
7	60
8	67
9	89
10	92
11	113
12	120
13	126
14	131
15	144
16	160
17	173
18	184
19	186
20	204
21	211
22	216
23	220
24	236
25	242
26	248
27	251
28	266
29	276
30	288
31	290
32	293
33	300
34	304
35	307
36	320
37	322
38	328
39	337
40	340
41	368
42	374
43	379
44	384
45	392