The index divisor conjecture for products of consecutive integers

Let kk be a non-negative integer and let n>2k+2n>2k+2, and define

Δ=n(n1)(nk).\Delta=n(n-1)\cdots(n-k).

Index divisor conjecture. There exists a prime p>kp>k which divides Δ\Delta. Moreover, the index at which pp occurs in the product n(n1)(nk)n(n-1)\cdots(n-k) does not divide the power to which it occurs in Δ\Delta, except when (n,k)=(27,3)(n,k)=(27,3).

This is a number-theoretic reformulation of the index divisor free prime conjecture. The paper presents it as a conjectural restatement because computing all exceptions is not currently feasible.

Sources & referencesView supporting material

Primary source

Heidi Benham, Alexander Galarraga, Benjamin Hutz, Joey Lupo, Wayne Peng and Adam Towsley, “Integrality and Thurston Rigidity for Bicritical PCF Polynomials”, arXiv:2212.02558 (2022).

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