Some random thoughts on pseudo-random things
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22.6.12
Recent Activity at math.stackexchange
On calculating
σ
(
n
2
)
(
mod
4
)
if
n
is odd
If
k
≡
1
(
mod
4
)
and
q
>
3
, does it follow that
q
k
σ
(
q
k
)
≡
q
σ
(
q
)
≡
2
(
mod
q
−
1
)
?
Is there a specific equation relating
σ
(
n
2
)
to
σ
(
n
)
, if
n
is odd?
An elementary congruence question in number theory
Exhaustive (?) list of cases giving
σ
(
n
)
≡
0
(
mod
4
)
whenever
n
is odd
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