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On k -Pell numbers which are sum of two Narayana’s cows numbers

Kouèssi Norbert AdédjiMohamadou BachabiAlain Togbé — 2025

Mathematica Bohemica

For any positive integer k 2 , let ( P n ( k ) ) n 2 - k be the k -generalized Pell sequence which starts with 0 , , 0 , 1 ( k terms) with the linear recurrence P n ( k ) = 2 P n - 1 ( k ) + P n - 2 ( k ) + + P n - k ( k ) for n 2 . Let ( N n ) n 0 be Narayana’s sequence given by N 0 = N 1 = N 2 = 1 and N n + 3 = N n + 2 + N n . The purpose of this paper is to determine all k -Pell numbers which are sums of two Narayana’s numbers. More precisely, we study the Diophantine equation P p ( k ) = N n + N m in nonnegative integers k , p , n and m .

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