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  2. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    Triangular numbers are a type of figurate number, other examples being square numbers and cube numbers. The n th triangular number is the number of dots in the triangular arrangement with n dots on each side, and is equal to the sum of the n natural numbers from 1 to n. The sequence of triangular numbers, starting with the 0th triangular number, is

  3. Doubly triangular number - Wikipedia

    en.wikipedia.org/wiki/Doubly_triangular_number

    In mathematics, the doubly triangular numbers are the numbers that appear within the sequence of triangular numbers, in positions that are also triangular numbers. That is, if T n = n ( n + 1 ) / 2 {\displaystyle T_{n}=n(n+1)/2} denotes the n {\displaystyle n} th triangular number, then the doubly triangular numbers are the numbers of the form ...

  4. Polygonal number - Wikipedia

    en.wikipedia.org/wiki/Polygonal_number

    The triangular number sequence is the representation of the numbers in the form of equilateral triangle arranged in a series or sequence. These numbers are in a sequence of 1, 3, 6, 10, 15, 21, 28, 36, 45, and so on.

  5. Tetrahedral number - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_number

    The third tetrahedral number equals the fourth triangular number as the nth k-simplex number equals the kth n-simplex number due to the symmetry of Pascal's triangle, and its diagonals being simplex numbers; similarly, the fifth tetrahedral number (35) equals the fourth pentatope number, and so forth The only numbers that are both tetrahedral ...

  6. Floyd's triangle - Wikipedia

    en.wikipedia.org/wiki/Floyd's_triangle

    The numbers along the left edge of the triangle are the lazy caterer's sequence and the numbers along the right edge are the triangular numbers. The nth row sums to n(n 2 + 1)/2, the constant of an n × n magic square (sequence A006003 in the OEIS).

  7. What are angel numbers? A guide to the numeric sequences and ...

    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.

  8. Square triangular number - Wikipedia

    en.wikipedia.org/wiki/Square_triangular_number

    Consequently, a square number is also triangular if and only if + is square, that is, there are numbers and such that =. This is an instance of the Pell equation x 2 − n y 2 = 1 {\displaystyle x^{2}-ny^{2}=1} with n = 8 {\displaystyle n=8} .

  9. 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.

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