WOLFRAM
|
DEMONSTRATIONS PROJECT
S
u
m
o
f
a
T
e
l
e
s
c
o
p
i
n
g
S
e
r
i
e
s
(
I
I
)
n
6
T
h
e
a
r
e
a
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f
e
a
c
h
c
o
l
o
r
e
d
r
e
g
i
o
n
i
s
n
n
+
1
-
n
-
1
n
=
1
n
(
n
+
1
)
,
s
o
1
1
·
2
+
1
2
·
3
+
⋯
+
1
n
(
n
+
1
)
=
n
n
+
1
a
n
d
∞
∑
n
=
1
1
n
(
n
+
1
)
=
1
.
