MARTIN KRZYWINSKI / SCIENCE PHOTO LIBRARY MARTIN KRZYWINSKI / SCIENCE PHOTO LIBRARY
Pi folding representation, illustration. The first 768 digits of Pi represented in a low-energy folding configuration (starting at centre, green dot) up to the famous Feynman point (the first set of six nines in a row, six white dots at lower right). In this sequence there are 298 prime digits with the other 470 being composite. Pi (the sixteenth letter of the Greek alphabet) is the symbol used in mathematics to represent the constant of the ratio of the circumference of a circle to its diameter. It is a crucial element of periodic functions and is found in many formulae in trigonometry and geometry. The value of this ratio is approximately 3.14159. It has been calculated to over one trillion digits beyond its decimal point, though as an irrational and transcendental number it continues infinitely without repetition or pattern.
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