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If x is a triangular number, a is an odd square, and b = a − 1 / 8 , then ax + b is also a triangular number. Note that b will always be a triangular number, because 8 T n + 1 = (2 n + 1) 2 , which yields all the odd squares are revealed by multiplying a triangular number by 8 and adding 1, and the process for b given a is an odd ...
The only numbers that are both tetrahedral and triangular numbers are (sequence A027568 in the OEIS): Te 1 = T 1 = 1 Te 3 = T 4 = 10 Te 8 = T 15 = 120 Te 20 = T 55 = 1540 Te 34 = T 119 = 7140. Te n is the sum of all products p × q where (p, q) are ordered pairs and p + q = n + 1
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This list of triangle topics includes things related to the geometric shape, either abstractly, as in idealizations studied by geometers, or in triangular arrays such as Pascal's triangle or triangular matrices, or concretely in physical space. It does not include metaphors like love triangle in which the word has no reference to the geometric ...
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
The number of domino tilings of a 4×4 checkerboard is 36. [10] Since it is possible to find sequences of 36 consecutive integers such that each inner member shares a factor with either the first or the last member, 36 is an Erdős–Woods number. [11] The sum of the integers from 1 to 36 is 666 (see number of the beast). 36 is also a ...
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.
Each centered triangular number has a remainder of 1 when divided by 3, and the quotient (if positive) is the previous regular triangular number. Each centered triangular number from 10 onwards is the sum of three consecutive regular triangular numbers. For n > 2, the sum of the first n centered triangular numbers is the magic constant for an n ...