The weak digit-one density conjecture for initial base-q digits

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Let p,qp,q be two distinct prime numbers. For each kk and each admissible integer mm, let dk,md_{k,m} denote the number of digit ones among the first mm digits of the qq-ary expansion of pkp^k. Weak digit-one density conjecture. There is a non-decreasing integer sequence m(k)m(k) tending to infinity, with m(k)≤klog⁡p/log⁡qm(k)\leq k\log p/\log q, such that

lim⁡k→∞dk,m(k)m(k)=1q.\lim_{k\to\infty}\frac{d_{k,m(k)}}{m(k)}=\frac{1}{q}.

The paper describes this as weaker than the preceding digit-one density conjecture and notes that it would imply the Erdős ternary problem.

References

Primary source

Han Yu, “An improvement on Furstenberg's intersection problem”, arXiv:1811.11073 (2021).

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