## Triangular numbers

## Enigma #12

Find the first triangular number to have more than **N** divisors.

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# multiples and dividers

## Triangular numbers

## Enigma #12

## Pythagorean triples

## Riddle #10

## The smallest multiple

## Riddle #6

## Sum all multiples of two numbers

## Riddle #2

## Sum all multiples of a number

## Riddle #1

– Solve all riddles on multiples and dividers

Find the first triangular number to have more than **N** divisors.

Given a number **N**, find the product of the numbers **a**, **b** and **c** that between them constitute a Pythagorean triple and whose sum is **N**.

Finds the smallest divisible number for all integers from 1 to **M**.

Find the sum of all multiples of two numbers **A** and **B** less than **M** (excluding).

Finds the sum of all multiples of a number **N** less than **M** (excluding).