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Answer :
$$
\begin{array}{|l}
\llap{7~~~~} 1729 \\ \hline
\llap{13~~~~} 247 \\ \hline
\llap{19~~~~} 19 \\ \hline
1
\end{array}
$$
Hence, the prime factors of 1729 = 7 x 13 x 19.
Here, 13 – 7 = 6 and 19 – 13 = 6
Hence the difference between two consecutive prime factors is 6.