Count letters occurence in text, specific to words with a given length.
Find the Final State of an Abelian Sandpile
Solve an ODE: second-order linear equation with constant coefficients
Roman numbers: how old is that building?
Easy Sequences 40: Quadratic Congruence
Easy Sequences 31: N-N's Sequence
Easy Sequences 30: Nearly Pythagorean Triangles
Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence
Easy Sequences 39: Perfect Squares in Pascal's Triangle
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