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Exact P-Adic Orders For Differences Of Motzkin Numbers, Tamas Lengyel
Exact P-Adic Orders For Differences Of Motzkin Numbers, Tamas Lengyel
Tamas Lengyel
For any prime p, we establish congruences modulo pn+1 for the difference of the pn+1th and pnth Motzkin numbers and determine the p-adic order of the difference. The results confirm recent conjectures on the order. The applied techniques involve the use of congruences for the differences of certain Catalan numbers and binomial coefficients, congruential identities for sums of Catalan numbers, central binomial and trinomial coefficients, infinite incongruent disjoint covering systems and the solution of congruential recurrences.