• The Pure and Applied Mathematics
• /
• v.20 no.3
• /
• pp.207-221
• /
• 2013

In this work we study the tribonacci numbers. We find a tribonacci triangle which is an analog of Pascal triangle. We also investigate an efficient method to compute any $n$th tribonacci numbers by matrix method, and find periods of the sequence by taking modular tribonacci number.