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How many ways can $N$ be written as a sum of terms in the form $2^i3^j$?
Given a positive integer $N$, let $f(N)$ be the number of ways $N$ can be decomposed as a sum of terms of the form $2^i3^j$, where each such term appears at most once in the sum. For example, $f(10) = ...
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How many residue classes mod $p$ does the image of a polynomial with integer coefficients occupy? (Status of a question of Chowla)
In his 1952 AMS Bulletin article "The Riemann zeta and allied functions" Chowla asks the following:
Given a polynomial $f$ with integer coefficients, how many residue classes mod $p$ does its image ...
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