A074388 - cp's OEIS frontend

A074388 Numbers of the form 2k^2 such that sigma(2k^2) is an odd square.

n	a(n)
1	195938
2	224450
3	13645088
4	15870978
5	18180450
6	29184800
7	1105252128
8	2363968800
9	2686005218
10	2917410498
11	3564550178
12	5056357922
13	8442721568
14	10814792450
15	18587462432
16	21292224800
17	48666384162
18	140836104992
19	212352534818
20	217566422658
21	288728564418
22	315325993248

[195938, 224450, 13645088, 15870978, 18180450, 29184800, 1105252128, 2363968800, 2686005218, 2917410498, 3564550178, 5056357922, 8442721568, 10814792450, 18587462432, 21292224800, 48666384162, 140836104992, 212352534818, 217566422658, 288728564418, 315325993248]

cp's OEIS Frontend

A074388 Numbers of the form 2k^2 such that sigma(2k^2) is an odd square.

Table of values

List of values

cp's OEIS Frontend

A074388 Numbers of the form 2*k^2 such that sigma(2*k^2) is an odd square.

Table of values

List of values

A074388 Numbers of the form 2k^2 such that sigma(2k^2) is an odd square.