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MathNet 2014 Question 35

Math Olympiad Vault · MathNet 2014

Question 35

All numbers of the form $2^{k}3^{s}$ ($k, s$ are non-negative whole numbers) were written in increasing order $1, 2, 3, 4, 6, 8, 9, 12, \ldots$ and formed the sequence $a_n$. Prove that there are infinitely many numbers $n$ satisfying the condition
$$
\frac{a_{n+1}}{a_n} \lt 1 + \frac{1}{10^{2014}}
$$