The Tribonacci sequence is a generalization of the Fibonacci sequence which starts with 0,0,1 and each term afterwards is the sum of the three preceding terms. Here, we show that the only Tribonacci numbers that are concatenations of two repdigits are 13,24,44,81. This paper continues a previous work that searched for Fibonacci numbers which are concatenations of two repdigits.

中文翻译：

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Tribonacci数字，带有两个数字区

Tribonacci序列是Fibonacci序列的概括，该序列以0,0,1开头，之后的每一项是前三个项的总和。在这里，我们显示只有Tribonacci数字是由两个repdigits串联而成的，分别是13,24,44,81。本文继续了先前的工作，该工作是搜索斐波那契数（Fibonacci number），它是两个repdigits的串联。