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

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

S={n∈N:10∤n, 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={n∈S: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.

References

Primary source

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

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