Yellow Pig Day – July 17: About, Origins, Fun Facts & Quotes

Yellow Pig Day is a unique celebration that takes place on July 17th each year in the United States. This whimsical holiday originated from the mathematical realm and has since gained popularity among mathematicians, students, and enthusiasts alike. With its vibrant and playful spirit, Yellow Pig Day offers a delightful opportunity to embrace the joy of numbers and mathematical curiosities. In this article, we will explore the origins of Yellow Pig Day, its significance, and how it is celebrated by individuals across the country.

Yellow Pig Day, observed on July 17th, is an eccentric holiday that holds a special place in the hearts of mathematicians and math enthusiasts in the United States. It emerged from the imaginations of two mathematicians, Michael Spivak and David C. Kelly, who created a fictional creature known as the Yellow Pig as a lighthearted means to explore mathematical concepts.

The Origins of Yellow Pig Day

The story of Yellow Pig Day dates back to the early 1960s when Michael Spivak and David C. Kelly were students at Princeton University. As the tale goes, the two friends became engrossed in a mathematical puzzle involving the number 17. They began jokingly discussing the existence of a mythical creature with seventeen toes, seventeen teeth, and the ability to sing in seventeen-part harmony. This whimsical creature, they decided, would be a yellow pig.

The Symbolism of the Yellow Pig

The Yellow Pig soon took on a symbolic meaning beyond its playful origins. The number 17, which initially sparked the creation of the creature, became associated with mathematical curiosity and discovery. The Yellow Pig embodies the joy of exploration, the pursuit of knowledge, and the quirkiness that can be found in mathematical pursuits.

Yellow Pig Day Traditions and Celebrations

On Yellow Pig Day, mathematicians, students, and enthusiasts come together to celebrate the world of mathematics and the Yellow Pig itself. People dress in yellow attire, wear pig-shaped accessories, and engage in mathematical games and puzzles. Yellow Pig songs are sung, and individuals share stories and jokes related to the beloved creature.

Yellow Pig Day in Education

Yellow Pig Day has also found its place in educational settings. Teachers and professors often use this holiday as an opportunity to engage students in math-related activities and spark their curiosity about the subject. It serves as a reminder that mathematics can be both fun and fascinating.

Yellow Pig Day Events and Activities

Across the United States, various events and activities are organized to commemorate Yellow Pig Day. Math clubs and organizations arrange gatherings, where participants engage in math-themed games, trivia contests, and problem-solving challenges. Some institutions host lectures and workshops by mathematicians who share their insights and experiences.

The Influence of Yellow Pig Day

Although Yellow Pig Day originated within the mathematical community, its influence has spread beyond those boundaries. The spirit of curiosity, creativity, and playfulness that the holiday embodies resonates with people from different walks of life. It has become a symbol of embracing unconventional thinking and finding joy in intellectual pursuits.

Yellow Pig Day in Popular Culture

Over the years, Yellow Pig Day has also made appearances in popular culture. References to the holiday can be found in books, movies, and even television shows. It has become a quirky and endearing element that adds a touch of whimsy to various forms of media.

10 Intriguing Facts About the Number 17

  • Prime Number: The number 17 is a prime number, meaning it is only divisible by 1 and itself. It holds a special place among prime numbers due to its unique properties and mathematical significance.
  • Mathematical Curiosities: In recreational mathematics, the number 17 has garnered attention for its fascinating patterns and curiosities. For example, if you multiply 17 by its reciprocal (1/17), the result is a repeating decimal of 0.0588235294117647, where the digits repeat in a cyclic manner.
  • Legal Voting Age: In many countries, including the United States, the age of 17 marks an important milestone for individuals. It signifies the final year before they reach the legal voting age of 18 and gain the right to participate in democratic processes.
  • Seventeen in Sports: In sports, the number 17 holds significance in various ways. In football (soccer), it is often associated with midfielders or forwards who wear this number on their jerseys. Additionally, in Formula 1 racing, the number 17 is traditionally not used as it is considered unlucky.
  • Seventeen-Year Cicadas: Certain species of cicadas, known as periodical cicadas, have a unique life cycle that spans 17 years. These cicadas emerge from the ground in large numbers after spending nearly two decades underground, creating a spectacle with their distinctive buzzing and vibrant presence.
  • Astronomy: In astronomy, the number 17 has its place. For instance, the Messier object M17 is a nebula in the constellation Sagittarius, commonly referred to as the Omega Nebula or the Swan Nebula. It is a breathtaking sight in the night sky, showcasing the beauty of celestial objects.
  • Seventeen Magazine: Seventeen is the name of a popular magazine aimed at teenage readers. It covers a wide range of topics, including fashion, beauty, relationships, and personal growth, catering to the interests and concerns of young adults.
  • Seventeen Provinces: In the 16th century, the Seventeen Provinces referred to a region in the Low Countries (now Belgium, the Netherlands, and Luxembourg) that were united under the rule of the House of Habsburg. These provinces played a significant role in European history and politics during that time.
  • Seventeen Seconds: “Seventeen Seconds” is the title of the second studio album released by the English rock band The Cure in 1980. The album marked a pivotal moment in the band’s musical direction and showcased their unique blend of post-punk and darkwave sounds.
  • The 17th President of the United States: Andrew Johnson, the 17th President of the United States, served from 1865 to 1869. He assumed office after the assassination of President Abraham Lincoln and played a crucial role in the reconstruction of the nation following the American Civil War.

Yellow Pig Day Dates

2023July 17Monday
2024July 17Wednesday
2025July 17Thursday
2026July 17Friday
2027July 17Saturday

Yellow Pig Day Quotes, Wishes & Messages

“Wishing you a whimsical and joyful Yellow Pig Day filled with mathematical wonders and delightful discoveries!”

“May your Yellow Pig Day be as bright and cheerful as the yellowest of pigs! Enjoy the playful spirit of this special celebration.”

“Sending you oinks of happiness and an abundance of mathematical fun on Yellow Pig Day! Embrace the joy of numbers and let your imagination soar.”

“On this Yellow Pig Day, let’s celebrate the beauty of mathematics and the quirky charm of the Yellow Pig. May your day be filled with laughter and fascinating mathematical adventures!”

“Happy Yellow Pig Day! May your day be filled with seventeen times the happiness, seventeen times the laughter, and seventeen times the fun!”

“Wishing you a day filled with mathematical puzzles that challenge your mind and bring a smile to your face. Happy Yellow Pig Day!”

“As we celebrate Yellow Pig Day, let’s remember to find joy in the unexpected, embrace our quirks, and explore the wonders of mathematics with a playful spirit. Happy celebrations!”

“On this Yellow Pig Day, may the number 17 bring you good fortune, exciting discoveries, and endless inspiration. Enjoy the festivities and let your mathematical imagination run wild!”

“Sending you a herd of yellow pigs to bring laughter, creativity, and a sense of wonder into your day. Happy Yellow Pig Day!”

“May the Yellow Pig bring a dash of sunshine and a truckload of mathematical fun into your life. Happy Yellow Pig Day!”


Yellow Pig Day, celebrated on July 17th in the United States, is a delightful holiday that combines mathematics, playfulness, and intellectual curiosity. It originated as a whimsical creation by two mathematicians and has since become a cherished tradition for those who appreciate the joys of numbers. Whether you are a mathematician, a student, or simply someone who enjoys a bit of whimsy, Yellow Pig Day offers a unique opportunity to celebrate the beauty of mathematics and the imaginative spirit it inspires.


What is Yellow Pig Day?

Yellow Pig Day is a holiday celebrated on July 17th in the United States. It originated as a playful creation by mathematicians and has become a beloved tradition among math enthusiasts.

How did Yellow Pig Day start?

Yellow Pig Day was created by Michael Spivak and David C. Kelly, two mathematicians from Princeton University, as a whimsical exploration of mathematical concepts.

What is the significance of the Yellow Pig?

The Yellow Pig represents mathematical curiosity and the joy of exploration. It has become a symbol of unconventional thinking and finding delight in intellectual pursuits.

How is Yellow Pig Day celebrated?

Yellow Pig Day is celebrated through various activities such as dressing in yellow attire, engaging in math-related games and puzzles, and sharing stories and jokes about the Yellow Pig.

Is Yellow Pig Day only for mathematicians?

No, Yellow Pig Day is enjoyed by mathematicians, students, and enthusiasts of all levels. It is a celebration of the playful side of mathematics and can be enjoyed by anyone with an interest in the subject.

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