# Euler problems/141 to 150

(Difference between revisions)

## 1 Problem 141

Investigating progressive numbers, n, which are also square.

Solution:

`problem_141 = undefined`

## 2 Problem 142

Perfect Square Collection

Solution:

`problem_142 = undefined`

## 3 Problem 143

Investigating the Torricelli point of a triangle

Solution:

`problem_143 = undefined`

## 4 Problem 144

Investigating multiple reflections of a laser beam.

Solution:

`problem_144 = undefined`

## 5 Problem 145

How many reversible numbers are there below one-billion?

Solution:

`problem_145 = undefined`

## 6 Problem 146

Investigating a Prime Pattern

Solution:

`problem_146 = undefined`

## 7 Problem 147

Rectangles in cross-hatched grids

Solution:

`problem_147 = undefined`

## 8 Problem 148

Exploring Pascal's triangle.

Solution:

`problem_148 = undefined`

## 9 Problem 149

Searching for a maximum-sum subsequence.

Solution:

`problem_149 = undefined`

## 10 Problem 150

Searching a triangular array for a sub-triangle having minimum-sum.

Solution:

`problem_150 = undefined`