A115167 - cp's OEIS frontend

A115167 Odd numbers k such that k-1 and k+1 have the same number of prime divisors with multiplicity.

n	a(n)
1	5
2	19
3	29
4	43
5	51
6	55
7	67
8	69
9	77
10	89
11	115
12	151
13	171
14	173
15	187
16	189
17	197
18	233
19	237
20	243
21	245
22	249
23	267
24	271
25	283
26	285
27	291
28	295
29	307
30	317
31	329
32	341
33	343
34	349
35	355
36	403
37	405
38	411
39	427
40	429
41	435
42	437
43	461
44	489
45	491
46	507
47	569
48	571
49	593
50	597
51	603
52	605
53	653
54	665

[5, 19, 29, 43, 51, 55, 67, 69, 77, 89, 115, 151, 171, 173, 187, 189, 197, 233, 237, 243, 245, 249, 267, 271, 283, 285, 291, 295, 307, 317, 329, 341, 343, 349, 355, 403, 405, 411, 427, 429, 435, 437, 461, 489, 491, 507, 569, 571, 593, 597, 603, 605, 653, 665]

cp's OEIS Frontend

A115167 Odd numbers k such that k-1 and k+1 have the same number of prime divisors with multiplicity.

Table of values

List of values

n	a(n)
1	5
2	19
3	29
4	43
5	51
6	55
7	67
8	69
9	77
10	89
11	115
12	151
13	171
14	173
15	187
16	189
17	197
18	233
19	237
20	243
21	245
22	249
23	267
24	271
25	283
26	285
27	291
28	295
29	307
30	317
31	329
32	341
33	343
34	349
35	355
36	403
37	405
38	411
39	427
40	429
41	435
42	437
43	461
44	489
45	491
46	507
47	569
48	571
49	593
50	597
51	603
52	605
53	653
54	665

n	a(n)
1	5
2	19
3	29
4	43
5	51
6	55
7	67
8	69
9	77
10	89
11	115
12	151
13	171
14	173
15	187
16	189
17	197
18	233
19	237
20	243
21	245
22	249
23	267
24	271
25	283
26	285
27	291
28	295
29	307
30	317
31	329
32	341
33	343
34	349
35	355
36	403
37	405
38	411
39	427
40	429
41	435
42	437
43	461
44	489
45	491
46	507
47	569
48	571
49	593
50	597
51	603
52	605
53	653
54	665

n	a(n)
1	5
2	19
3	29
4	43
5	51
6	55
7	67
8	69
9	77
10	89
11	115
12	151
13	171
14	173
15	187
16	189
17	197
18	233
19	237
20	243
21	245
22	249
23	267
24	271
25	283
26	285
27	291
28	295
29	307
30	317
31	329
32	341
33	343
34	349
35	355
36	403
37	405
38	411
39	427
40	429
41	435
42	437
43	461
44	489
45	491
46	507
47	569
48	571
49	593
50	597
51	603
52	605
53	653
54	665