List questions from recreational-mathematics

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Colouring 10 dots to form equilateral triangles

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Contiguous subsequences with equal sums

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How do you write 400 trillion using Roman numerals?

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Class of integrals: $I(a)=\int_0^\infty \frac{dx}{e^x+ax}$

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Which positive integers under 2007 are the digit-sum of a perfect square?

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Multilateration of Sound in 3D Space

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Corner Swappings on Rubiks Cube

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Bill and Fred sent their 30 shirts to the laundry. An elementary number theory problem.

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How to find the closest number to 100,000 and less than 100,000 which is a sum of two squares?

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Which values for $x$ make $x(x + 180)$ a square?

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How do I calculate how many ways 14 non-attacking bishops can be placed on a chessboard?

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Distribution of the first repeated value in an i.i.d. sequence

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Special properties of the number $146$

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Are there nonograms of odd dimensions with a strong property

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List Question

Antisymmetric Table Puzzle where the Rows/Columns Sum to Zero

Colouring 10 dots to form equilateral triangles

Contiguous subsequences with equal sums

How do you write 400 trillion using Roman numerals?

Class of integrals: $I(a)=\int_0^\infty \frac{dx}{e^x+ax}$

Which positive integers under 2007 are the digit-sum of a perfect square?

Multilateration of Sound in 3D Space

Corner Swappings on Rubiks Cube

Bill and Fred sent their 30 shirts to the laundry. An elementary number theory problem.

How to find the closest number to 100,000 and less than 100,000 which is a sum of two squares?

Which values for $x$ make $x(x + 180)$ a square?

How do I calculate how many ways 14 non-attacking bishops can be placed on a chessboard?

Distribution of the first repeated value in an i.i.d. sequence

Special properties of the number $146$

Are there nonograms of odd dimensions with a strong property

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