Compute
\[\sum_{j = 0}^\infty \sum_{k = 0}^\infty 2^{-3k - j - (k + j)^2}.\]
Question:
Compute
\[\sum_{j = 0}^\infty \sum_{k = 0}^\infty 2^{-3k - j - (k + j)^2}.\]
Answer:
Let's think step by step.

user
\frac{4}{3}
Compute
\[\sum_{j = 0}^\infty \sum_{k = 0}^\infty 2^{-3k - j - (k + j)^2}.\]
train