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Figurate number triangle
the fly, the train, the second train, and their Zeno's paradox
Integer sequence - 2 : Kolakoski sequence
Last non-zero digit
Solve an ODE: equidimensional equation
Find pairs of primes with the same digit sum
Determine the winner of a goofy golf tournament
Count the primes in Collatz sequences
Compute the arithmetic derivative of integers
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