421

Answers
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12
Ethio Integers?
12
Non-Kahler manifolds where the different Laplacians are compatible
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Finite interpolation by a nondecreasing polynomial
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Injective modules and Pontrjagin duals
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Balancing problem
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Is there an English translation of Kuratowski’s theorem on forbidden minors of planar graphs?
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tr(ab) = tr(ba)?
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Are commutative alternative rings associative?
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Nonzero digits in n!
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Finding lots of discrete vectors in fairly general position
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The number of irreducible polynomials over ${\mathbb F}_p$
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Ternary “Lie structure”
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Acute triangulation
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Planar sets closed under intersection of circles
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A generalization of Catalan numbers
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Proof of a combinatorial identity (possibly using trigonometric identities)
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Rolling a die until the sum is at least some number
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A product approximation to the Taylor series of the exponential
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Is the reals the smallest connected ordered topological ring?
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Conformal maps in higher dimensions
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Does this problem have a name? [Ducci Sequences]
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Combinatorial Interpretation
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Biography of Felix Hausdorff
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Wanted: a graph $G$ without bridges, whose square is not hamiltonian
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A gamma function identity
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Walking to infinity on the primes: The prime-spiral moat problem
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Elementary problem with Fibonacci numbers
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How to recognise that the polynomial method might work
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Number of integral points inside a small sphere
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Maximal number of edges and triangular cells for n points in a triangular lattice
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