NumberOpedia

  • 5 is a natural number following 4 and preceding 6 and is a prime number.
  • In general, we have 5 fingers on each hand and 5 toes on each foot.
  • There are 5 vowels in the English language: a, e, i, o and u.
  • Five is the number of senses we have: hearing, sight, smell, taste, and touch.
  • Two people give a high five by slapping their right hands raised high.
  • The number 5 is the only prime that is both the sum and the difference of two primes.
  • The number 5 is a pyramidal number.
  • 5 can be represented as the difference of two squares: 5 = 32 − 22.
  • A plane closed polygon with five sides is called a pentagon.
  • This five-pointed figure is called a pentagram:
  • There are five regular polyhedrons: tetrahedron,
  • hexahedron, octahedron, dodecahedron, and icosahedron.
  • The only prime digit in which a perfect square can end.
  • The word PRIME contains 5 letters.
  • The number 5 = 22 + 1 is a Fermat prime – an odd prime of the form 2k + 1.
  • Euclid gave 5 postulates of plane geometry.
  • The only prime digit in which a perfect square can end.
  • FIVE is the only prime written with an equal (prime) number of distinct vowels and consonants, i.e., IE & FV.
  • The following relation is true: 5 = 3! – 2! + 1!
  • A limerick is a light humorous or nonsensical verse of 5 lines that usually has the rhyme scheme aabba.
  • A conic is determined using five points.
  • On the seven-segment display, it is represented by five segments at four successive turns from top to bottom, rotating counterclockwise first, then clockwise, and vice-versa.
  • A hypertetrahedron, the 4-dimensional analogue of the tetrahedron, has five vertices.

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