Number Sequence Series-Question 5

This a series of questions that are created by myself.

I will give a hint in 24 hours and my answer in 3 days given that nobody could answer my question.

Here is question 5:

342,765,?,242325 (It seems like it is easy and might have several answers but there is only one answer and the logic must be the neatest)  If you guys want some extremely challenging questions. Please check these two questions posted by me.

Number sequences: 000, X00... and 6X000X9, 700XX08

What are the alphabets in the question mark?

$$131112$$. If the number is $$abc$$, the new number is $$(a+b)(b+c)(c+a)$$. The number keeps these as 'single digits', hence the next number is $$(13+11)(11+12)(12+13)=242325$$.

• I hope this is a well-explained answer (+1) – Ak19 May 19 '19 at 14:37
• Congrats! This is the right answer. – LETTERKING May 20 '19 at 14:46