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Prime Pythagorean triangles.

Dubner, Harvey ; Forbes, Tony

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Arithmetic and growth of periodic orbits.

Puri, Yash ; Ward, Thomas

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Permutations with inversions.

Margolius, Barbara H.

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Integral representations of Catalan and related numbers.

Penson, K.A. ; Sixdeniers, J.-M.

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The gcd-sum function.

Broughan, Kevin A.

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A million new amicable pairs.

Garcia, Mariano

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Improved bounds on the number of ternary square-free words.

Grimm, Uwe

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Hankel matrices and lattice paths.

Woan, Wen-Jin

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Algorithms for Bernoulli numbers and Euler numbers.

Chen, Kwang-Wu

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Extended Bell and Stirling numbers from hypergeometric exponentiation.

Sixdeniers, J.-M. ; Penson, K.A. ; Solomon, A.I.

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On powers of 2 dividing the values of certain plane partition functions.

Sellers, James A. ; Frey, Darrin D.

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Dyck paths with no peaks at height k.

Peart, Paul ; Woan, Wen-Jin

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The Hankel transform and some of its properties.

Layman, John W.

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