A276290 - cp's OEIS frontend

A276290 Products of odd primes p and q such that either p or q is in the trajectory of (p*q)+1 under the Collatz 3x+1 map (A014682).

n	a(n)
1	25
2	35
3	55
4	65
5	77
6	85
7	95
8	115
9	133
10	143
11	145
12	155
13	161
14	185
15	203
16	205
17	209
18	215
19	217
20	235
21	253
22	259
23	265
24	287
25	295
26	305
27	329
28	341
29	355
30	365
31	371
32	391
33	395
34	403
35	407
36	415
37	427
38	437
39	445

[25, 35, 55, 65, 77, 85, 95, 115, 133, 143, 145, 155, 161, 185, 203, 205, 209, 215, 217, 235, 253, 259, 265, 287, 295, 305, 329, 341, 355, 365, 371, 391, 395, 403, 407, 415, 427, 437, 445]

cp's OEIS Frontend

A276290 Products of odd primes p and q such that either p or q is in the trajectory of (p*q)+1 under the Collatz 3x+1 map (A014682).

Table of values

List of values

n	a(n)
1	25
2	35
3	55
4	65
5	77
6	85
7	95
8	115
9	133
10	143
11	145
12	155
13	161
14	185
15	203
16	205
17	209
18	215
19	217
20	235
21	253
22	259
23	265
24	287
25	295
26	305
27	329
28	341
29	355
30	365
31	371
32	391
33	395
34	403
35	407
36	415
37	427
38	437
39	445

n	a(n)
1	25
2	35
3	55
4	65
5	77
6	85
7	95
8	115
9	133
10	143
11	145
12	155
13	161
14	185
15	203
16	205
17	209
18	215
19	217
20	235
21	253
22	259
23	265
24	287
25	295
26	305
27	329
28	341
29	355
30	365
31	371
32	391
33	395
34	403
35	407
36	415
37	427
38	437
39	445

n	a(n)
1	25
2	35
3	55
4	65
5	77
6	85
7	95
8	115
9	133
10	143
11	145
12	155
13	161
14	185
15	203
16	205
17	209
18	215
19	217
20	235
21	253
22	259
23	265
24	287
25	295
26	305
27	329
28	341
29	355
30	365
31	371
32	391
33	395
34	403
35	407
36	415
37	427
38	437
39	445