# Category Archives: Uncategorized

## What is the number of the parking space?

Source:   Hong Kong elementary school

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## Which of the following two numbers is larger

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## Pythagorean triangles – Area + shortest leg is a square

Find Pythagorean triangles in which the sum of the area and the shortest leg is a square.   Here are the first three examples:                             … Continue reading

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## Pythagorean triangle whose perimeter is p^2 and area p^3

Find a Pythagorean triangle whose perimeter is a square     such that     equals the area. Here are two examples:       Any other example?                     … Continue reading

## Triangular numbers between consecutive square numbers

Let     be the n-th m-gonal number,   m-gonal number with index     ……….       Checking up to 50 the following proposition: If there are exactly two triangular numbers between     and   … Continue reading

## A^n + B^n + C^n = D^n + E^n + F^n, n = 2,6

## SquareFree semiprimes n, σ(n), φ(n), and σ(n) * φ(n)

is the sum of divisors function Euler’s totient function   is the number of positive integers not exceeding     that have no common divisors with     (other than the common divisor 1). In other words, … Continue reading

## Identity of two equal sums of n distinct squares

Establish the following identity: