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Results tagged with co.combinatorics
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user 3533
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
9
votes
Average distance between numbers of the form $2^{a}3^{b}$
More generally, if you fix a set of primes $p_1, \ldots, p_r$, and let $n_1=1 < n_2 < \cdots$ be the set of positive integers composed of primes in this set, then one has (effectively)
$$
n_{i+1}-n_i …
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