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The sequence below, I call the $\text{Ternary Sequence™}$.

\begin{gather*} \text{T}(1) = 1\\ \text{T}(2) = 2\\ \text{T}(3) = 5\\ \text{T}(4) = 5\\ \text{T}(5) = 3\\ \text{T}(6) = 5\\ \text{T}(7) = 7\\ \text{T}(8) = 14\\ \text{T}(9) = \hspace{0.4em} \color{blue}{???}\\ \text{T}(10) = 3\\ \text{T}(11) = 4\\ \text{T}(12) = 5\\ \text{T}(13) = 25\\ \text{T}(14) = 14\\ \text{T}(15) = 15\\ \dots \end{gather*}

The sequence continues infinitely.

What is the pattern that these numbers follow?

What is $\text{T}(9)$?

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    $\begingroup$ I like the fact that all your questions have TradeMark in them :P $\endgroup$ May 21, 2020 at 13:16
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    $\begingroup$ @SagarChand It has been a trend for years before I joined. Some examples. $\endgroup$ May 21, 2020 at 14:00

1 Answer 1

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$T(n)$ = Ternary ( $f(n)$ )

where

$f(n)$ is minimum number $x$ formed with $0,1,2$ such that $n | x$.

By this logic T(9) is

Ternary($12222$) = $161$

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  • $\begingroup$ Hey, apologies if this question sounds naive, but how is T(3) = 5? T(3) = Ternary(12) , then what? Like how is Ternary(12222) = 161? $\endgroup$ May 24, 2020 at 7:05
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    $\begingroup$ @SagarChand T(3) = 5 since the smallest decimal number consisting of only 0, 1, and 2 that is divisible by 3 is 12. If 12 were a number in base 3 (ternary), it would represent 5 in decimal ($1 \cdot 3^1 + 2 \cdot 3^0$). If 12222 were a ternary number, it would be 161 in decimal ($1 \cdot 3^4 + 2 \cdot 3^3 + 2 \cdot 3^2 + 2 \cdot 3^1 + 2 \cdot 3^0$). $\endgroup$ Jun 17, 2020 at 10:52
  • $\begingroup$ @eyl327 got it now thanks $\endgroup$ Jun 17, 2020 at 11:22

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