A339699 - cp's OEIS frontend

A339699 Numbers m such that 3^m-1 and 3^m+1 have the same number k of prime factors counted with multiplicity.

n	a(n)
1	5
2	23
3	25
4	31
5	41
6	43
7	47
8	53
9	67
10	101
11	109
12	113
13	127
14	137
15	141
16	149
17	155
18	187
19	191
20	195
21	203
22	209
23	253
24	275
25	317
26	322
27	329
28	367
29	389
30	409
31	415
32	503
33	537
34	565
35	613
36	623
37	637
38	643

[5, 23, 25, 31, 41, 43, 47, 53, 67, 101, 109, 113, 127, 137, 141, 149, 155, 187, 191, 195, 203, 209, 253, 275, 317, 322, 329, 367, 389, 409, 415, 503, 537, 565, 613, 623, 637, 643]

cp's OEIS Frontend

A339699 Numbers m such that 3^m-1 and 3^m+1 have the same number k of prime factors counted with multiplicity.

Table of values

List of values

n	a(n)
1	5
2	23
3	25
4	31
5	41
6	43
7	47
8	53
9	67
10	101
11	109
12	113
13	127
14	137
15	141
16	149
17	155
18	187
19	191
20	195
21	203
22	209
23	253
24	275
25	317
26	322
27	329
28	367
29	389
30	409
31	415
32	503
33	537
34	565
35	613
36	623
37	637
38	643

n	a(n)
1	5
2	23
3	25
4	31
5	41
6	43
7	47
8	53
9	67
10	101
11	109
12	113
13	127
14	137
15	141
16	149
17	155
18	187
19	191
20	195
21	203
22	209
23	253
24	275
25	317
26	322
27	329
28	367
29	389
30	409
31	415
32	503
33	537
34	565
35	613
36	623
37	637
38	643

n	a(n)
1	5
2	23
3	25
4	31
5	41
6	43
7	47
8	53
9	67
10	101
11	109
12	113
13	127
14	137
15	141
16	149
17	155
18	187
19	191
20	195
21	203
22	209
23	253
24	275
25	317
26	322
27	329
28	367
29	389
30	409
31	415
32	503
33	537
34	565
35	613
36	623
37	637
38	643