The density-one conjecture for numbers never reaching a v-palindromic number

Let r(n)r(n) denote the reversal of the decimal digits of nn, and define

S={nN:10n, n<r(n)}.S=\{n\in\mathbb{N}:10\nmid n,\ n<r(n)\}.

Let c(n)c(n) be the least number of repetitions of the decimal digits of nn needed to reach a vv-palindromic number, with c(n)=c(n)=\infty when no such repetition reaches one, and define

T={nS:c(n)=}.T=\{n\in S:c(n)=\infty\}.

Density-one conjecture. The asymptotic density of TT in SS is 11. The paper proves that an explicitly described infinite family has c(n)=c(n)=\infty, and asks for a simple way to determine whether c(n)c(n) is finite. The stronger assertion that almost every element of SS belongs to TT remains open.

Sources & referencesView supporting material

Primary source

Daniel Tsai, “A recurring pattern in natural numbers of a certain property”, arXiv:2010.03151 (2020).

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