A136034 - cp's OEIS frontend

A136034 a(n) = smallest number k such that number of distinct prime factors of 2^k-1 is exactly n.

n	a(n)
0	1
1	2
2	4
3	8
4	12
5	20
6	24
7	40
8	36
9	48
10	88
11	60
12	72
13	150
14	132
15	120
16	156
17	144
18	200
19	204
20	210
21	180
22	324
23	476
24	288
25	300
26	432
27	396
28	480
29	360
30	468
31	576
32	700
33	504
34	420
35	648
36	540
37	660
38	792
39	720

[1, 2, 4, 8, 12, 20, 24, 40, 36, 48, 88, 60, 72, 150, 132, 120, 156, 144, 200, 204, 210, 180, 324, 476, 288, 300, 432, 396, 480, 360, 468, 576, 700, 504, 420, 648, 540, 660, 792, 720]

cp's OEIS Frontend

A136034 a(n) = smallest number k such that number of distinct prime factors of 2^k-1 is exactly n.

Table of values

List of values

n	a(n)
0	1
1	2
2	4
3	8
4	12
5	20
6	24
7	40
8	36
9	48
10	88
11	60
12	72
13	150
14	132
15	120
16	156
17	144
18	200
19	204
20	210
21	180
22	324
23	476
24	288
25	300
26	432
27	396
28	480
29	360
30	468
31	576
32	700
33	504
34	420
35	648
36	540
37	660
38	792
39	720

n	a(n)
0	1
1	2
2	4
3	8
4	12
5	20
6	24
7	40
8	36
9	48
10	88
11	60
12	72
13	150
14	132
15	120
16	156
17	144
18	200
19	204
20	210
21	180
22	324
23	476
24	288
25	300
26	432
27	396
28	480
29	360
30	468
31	576
32	700
33	504
34	420
35	648
36	540
37	660
38	792
39	720

n	a(n)
0	1
1	2
2	4
3	8
4	12
5	20
6	24
7	40
8	36
9	48
10	88
11	60
12	72
13	150
14	132
15	120
16	156
17	144
18	200
19	204
20	210
21	180
22	324
23	476
24	288
25	300
26	432
27	396
28	480
29	360
30	468
31	576
32	700
33	504
34	420
35	648
36	540
37	660
38	792
39	720