The Bogota Puzzles

Calculate the number of a neighbor's grandchildren based on their ages, figure out the denominations of a government's postage stamps, swap the positions of two chess pieces in the least number of moves, and solve other intriguing puzzles with this captivating compendium.
Inspired by such illustrious collections as the The Canterbury Puzzles, The Moscow Puzzles, and The Tokyo Puzzles, Colombian mathematician and professor Bernardo Recamán assembled these 80 brainteasers, which he acquired while living and working in Bogotá. Recamán's colleagues, students, friends, and acquaintances contributed to this stimulating potpourri of word problems, sudoku-style challenges, and other math-based diversions. Complete solutions appear at the end.

Colombian mathematician and professor Bernardo Recamán teaches students of all ages, from preschool to university. A devotee of Martin Gardner's books, he is a firm believer in the power of recreational mathematics to illuminate classroom teaching.

Magical Ellipses
My Neighbor’s Grandchildren
Triangle of Primes and Squares
Economical Numbers
Mxied Smus
Postage Stamps
Odd Number
Gentle Cube
Unlucky Triangle
Richard’s Family
Fourteen Primes
Number Snake
Naked Sudoku
Cross-Number
Packing
Knights and Rooks
Drinking Again?
Thirteen Friends and Their Birthdays
Squares around a Circle
My Five Nieces
Sixteen Integers
A Million Terms
The Housing Estate
Alice and Bob’s Numbered Cards
Products or Sums
Five Equations
A Few of My Favorite Numbers
My Social Security Card Number
Peter, Paul, and Mary’s Marbles
A Tour around a Triangle
A Gathering of Number Theorists
ID Numbers
Who Is Who?
Billiard Balls
The Snake and the Hunter
Self-Numbers
Ramanujan Sums
Crosses and Circles
Shopping Spree
Early Bird Numbers
Tango
Just Threes
Some of My Favorite Olympiad Problems
A Number Game for Two
A Handful of Quickies . . . and Not So Quick
One of My PINs
Mary and Lucy’s Coins
Ready for the Music?
Six Sisters on the Ski Lift
A Soccer Tournament
Carpets for My Rooms
Two Friends
Bags of Marbles
Three Farmers
Two Numbers
Remembering Ramanujan
Two Cars
Ten Marbles
Three Jugs
Chess Puzzles
Crosswords
Infamously
Happy Grid
Thirty Coins
My Late Uncle
Thirteen Squares
Palindrome
A Perfect Crossword
Country Mint
Autobiographical Number
A Knight’s Tour
The Marathon
Wooden Cube
As Easy as ABCDEFG
Seven Numbers
Shopping Bags
The Christmas Tennis Tournament
Soccer League
Prime Board
Goodbye and . . .