A247956 - cp's OEIS frontend

A247956 a(n) is the smallest number k such that sigma(k) = 2^n or 0 if no such k exists.

n	a(n)
0	1
1	0
2	3
3	7
4	0
5	21
6	0
7	93
8	217
9	381
10	651
11	0
12	2667
13	8191
14	11811
15	24573
16	57337
17	82677
18	172011
19	393213
20	761763
21	1572861
22	2752491
23	5332341
24	11010027
25	21845397
26	48758691
27	85327221
28	199753347
29	341310837
30	677207307
31	1398273429
32	3220807683
33	6192353757
34	10836557067

[1, 0, 3, 7, 0, 21, 0, 93, 217, 381, 651, 0, 2667, 8191, 11811, 24573, 57337, 82677, 172011, 393213, 761763, 1572861, 2752491, 5332341, 11010027, 21845397, 48758691, 85327221, 199753347, 341310837, 677207307, 1398273429, 3220807683, 6192353757, 10836557067]

cp's OEIS Frontend

A247956 a(n) is the smallest number k such that sigma(k) = 2^n or 0 if no such k exists.

Table of values

List of values