A295043 - cp's OEIS frontend

A295043 a(n) is the largest 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	31
6	0
7	127
8	217
9	381
10	889
11	0
12	3937
13	8191
14	11811
15	27559
16	57337
17	131071
18	253921
19	524287
20	1040257
21	1777447
22	4063201
23	7281799
24	16646017
25	32247967
26	66584449
27	116522119
28	225735769
29	516026527
30	1073602561
31	2147483647
32	4294434817
33	7515217927
34	15032385529

[1, 0, 3, 7, 0, 31, 0, 127, 217, 381, 889, 0, 3937, 8191, 11811, 27559, 57337, 131071, 253921, 524287, 1040257, 1777447, 4063201, 7281799, 16646017, 32247967, 66584449, 116522119, 225735769, 516026527, 1073602561, 2147483647, 4294434817, 7515217927, 15032385529]

cp's OEIS Frontend

A295043 a(n) is the largest number k such that sigma(k) = 2^n or 0 if no such k exists.

Table of values

List of values