# Euler problems/141 to 146

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< Euler problems

Revision as of 10:34, 20 July 2007 by Henk-Jan van Tuyl (talk | contribs) (Corrected the links to the Euler project)

## Problem 141

Investigating progressive numbers, n, which are also square.

Solution:

```
problem_141 = undefined
```

## Problem 142

Perfect Square Collection

Solution:

```
problem_142 = undefined
```

## Problem 143

Investigating the Torricelli point of a triangle

Solution:

```
problem_143 = undefined
```

## Problem 144

Investigating multiple reflections of a laser beam.

Solution:

```
problem_144 = undefined
```

## Problem 145

How many reversible numbers are there below one-billion?

Solution:

```
problem_145 = undefined
```

## Problem 146

Investigating a Prime Pattern

Solution:

```
problem_146 = undefined
```