Archive for Montpellier

Le Monde puzzle [#1083]

Posted in Books, Kids, R, Travel with tags , , , , , , on February 7, 2019 by xi'an

A Le Monde mathematical puzzle that seems hard to solve without the backup of a computer (and just simple enough to code on a flight to Montpellier):

Given the number N=2,019, find a decomposition of N as a sum of non-trivial powers of integers such that (a) the number of integers in the sum is maximal or (b) all powers are equal to 4.  Is it possible to write N as a sum of two powers?

It is straightforward to identify all possible terms in these sums by listing all powers of integers less than N

for (pow in 3:11)

which leads to 57 distinct powers. Sampling at random from this collection at random produces a sum of 21 perfect powers:


But looking at the 22 smallest numbers in the pool of powers leads to 2019, which is a sure answer. Restricting the terms to powers of 4 leads to the sequence

1⁴+2⁴+3⁴+5⁴+6⁴ = 2019

And starting from the pools of all possible powers in a decomposition of 2019 as the sum of two powers shows this is impossible.

Grange Thieri [Pic Saint-Loup]

Posted in Wines with tags , , , , , on December 20, 2018 by xi'an

Grès de Montpellier [Mas de Lunès]

Posted in Kids, pictures, Travel, Wines with tags , , , , , , on September 20, 2018 by xi'an

Pic Saint Loup [Clos Marie]

Posted in Travel, Wines with tags , , , , , , on July 20, 2018 by xi'an

Domaine Mortiès

Posted in pictures, Wines with tags , , , , , on April 20, 2018 by xi'an