A180162 - cp's OEIS frontend

A180162 a(n) is the smallest number N such that sigma(N) is an n-th power but not a higher power, with a(n) = 0 if no such number exists.

n	a(n)
0	1
1	2
2	3
3	7
4	510
5	21
6	17490
7	93
8	217
9	381
10	651
11	118879530
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

[1, 2, 3, 7, 510, 21, 17490, 93, 217, 381, 651, 118879530, 2667, 8191, 11811, 24573, 57337, 82677, 172011, 393213, 761763, 1572861, 2752491, 5332341, 11010027, 21845397, 48758691, 85327221, 199753347, 341310837, 677207307, 1398273429]

cp's OEIS Frontend

A180162 a(n) is the smallest number N such that sigma(N) is an n-th power but not a higher power, with a(n) = 0 if no such number exists.

Table of values

List of values