List questions from recreational-mathematics

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Triangulation of Lattice Polygons

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Composite numbers which divide the concatenation of their prime factors in chaos order

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Diophantine-like equations

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Prime number where all (ordered) combinations of digits are prime

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All polygons satisfy the "normal" property.

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Smallest pandigital number perfect square

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Mental calculation of the day of birth

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Intuitive/heuristic explanation of Polya's urn

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figuring out an integer function

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Which week day(s) cannot be the first day of a century?

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Finding an $a$, such that $\forall x(x^x-a\cdot x!=0).$

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Is the fuction $f(x) = \frac{7}{e^x - 2}$ continuous on the interval $ [-1,1]$

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"Problems worthy of attack prove their worth by fighting back.”

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Vertical visibility graphs -- canonical icosahedral graph

Published on 16 Apr 2026 - 2:51

List Question

Interesting problem from brother's test prep

Triangulation of Lattice Polygons

Composite numbers which divide the concatenation of their prime factors in chaos order

Diophantine-like equations

Prime number where all (ordered) combinations of digits are prime

All polygons satisfy the "normal" property.

Smallest pandigital number perfect square

Mental calculation of the day of birth

Intuitive/heuristic explanation of Polya's urn

figuring out an integer function

Which week day(s) cannot be the first day of a century?

Finding an $a$, such that $\forall x(x^x-a\cdot x!=0).$

Is the fuction $f(x) = \frac{7}{e^x - 2}$ continuous on the interval $ [-1,1]$

"Problems worthy of attack prove their worth by fighting back.”

Vertical visibility graphs -- canonical icosahedral graph

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