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  2. Truncated triangular pyramid number - Wikipedia

    en.wikipedia.org/wiki/Truncated_Triangular...

    A pyramid with side length 5 contains 35 spheres. Each layer represents one of the first five triangular numbers. A truncated triangular pyramid number [1] is found by removing some smaller tetrahedral number (or triangular pyramidal number) from each of the vertices of a bigger tetrahedral number.

  3. Pyramidal number - Wikipedia

    en.wikipedia.org/wiki/Pyramidal_number

    Geometric representation of the square pyramidal number 1 + 4 + 9 + 16 = 30. A pyramidal number is the number of points in a pyramid with a polygonal base and triangular sides. [1] The term often refers to square pyramidal numbers, which have a square base with four sides, but it can also refer to a pyramid with any number of sides. [2]

  4. Square pyramidal number - Wikipedia

    en.wikipedia.org/wiki/Square_pyramidal_number

    As well as counting spheres in a pyramid, these numbers can be used to solve several other counting problems. For example, a common mathematical puzzle involves counting the squares in a large n by n square grid. [11] This count can be derived as follows: The number of 1 × 1 squares in the grid is n 2. The number of 2 × 2 squares in the grid ...

  5. What is your angel number? How to find which repeating ... - AOL

    www.aol.com/angel-number-repeating-numeral-meant...

    Angel numbers are repeating number sequences, often used as a guide for deeper spiritual exploration. These sequences can range from 000 to 999 and have a distinct meaning and energy.

  6. What are angel numbers? A guide to the numeric ... - AOL

    www.aol.com/angel-numbers-guide-numeric...

    Angel numbers are repeating number sequences, often used as guides for deeper spiritual exploration. Ranging from 000 to 999 , each sequence carries its own distinct meaning and energy.

  7. Tetrahedral number - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_number

    Te 1 = 1 2 = 1 Te 2 = 2 2 = 4 Te 48 = 140 2 = 19600. Sir Frederick Pollock conjectured that every positive integer is the sum of at most 5 tetrahedral numbers: see Pollock tetrahedral numbers conjecture. The only tetrahedral number that is also a square pyramidal number is 1 (Beukers, 1988), and the only tetrahedral number that is also a ...

  8. Cannonball problem - Wikipedia

    en.wikipedia.org/wiki/Cannonball_problem

    A triangular-pyramid version of the cannonball problem, which is to yield a perfect square from the N th Tetrahedral number, would have N = 48. That means that the (24 × 2 = ) 48th tetrahedral number equals to (70 2 × 2 2 = 140 2 = ) 19600. This is comparable with the 24th square pyramid having a total of 70 2 cannonballs. [5]

  9. Belphegor's prime - Wikipedia

    en.wikipedia.org/wiki/Belphegor's_prime

    Symbol of Belphegor's prime, represented by the Greek letter π upside down. Belphegor's prime is the palindromic prime number 1 000 000 000 000 066 600 000 000 000 001 (10 30 + 666 × 10 14 + 1), a number which reads the same both backwards and forwards and is only divisible by itself and one.