The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It...

entitled "Cheryl’s house number problem". Ages of Three Children puzzle Sum and Product Puzzle van Ditmarsch, Hans; Hartley, Michael Ian; Kooi, Barteld; Welton...

such as children in a mixed-parent household. Cheryl's Birthday Sum and Product Puzzle Meyers, Leroy F.; See, Richard (1990-04-01). "The Census-Taker Problem"...

repeated in any row or column. Impossible Puzzle, or "Sum and Product Puzzle", which is not impossible -gry, a word puzzle List of undecidable problems, no algorithm...

A Survo puzzle is a kind of logic puzzle presented (in April 2006) and studied by Seppo Mustonen. The name of the puzzle is associated with Mustonen's...

Mathematics Education (RME). Freudenthal published the Impossible Puzzle, a mathematical puzzle that appears to lack sufficient information for a solution,...

feedback through colored tiles that indicate correct letters and their placement. A single puzzle is released daily, with all players attempting to solve the...

the most well known puzzles that played a role in the development of DEL. Other significant puzzles include the sum and product puzzle, the Monty Hall dilemma...

The equity premium puzzle refers to the inability of an important class of economic models to explain the average equity risk premium (ERP) provided by...

repeated digital sum) of a natural number in a given radix is the (single digit) value obtained by an iterative process of summing digits, on each iteration...

Combination Costas array Cycle index Cycle notation Cycles and fixed points Cyclic order Direct sum of permutations Enumerations of specific permutation classes...

sufficiently large even number can be written as the sum of a prime and a semiprime (the product of two primes) – e.g., 100 = 23 + 7·11. Despite being...

always gives another bijection, the product of two permutations is again a permutation. In two-line notation, the product of two permutations is obtained...

casual print and online games published by The New York Times, an American newspaper. Originating with the newspaper's crossword puzzle in 1942, NYT Games...

A balance puzzle or weighing puzzle is a logic puzzle about balancing items—often coins—to determine which one has different weight than the rest, by...

Sudoku puzzles to answer questions such as "How many filled Sudoku grids are there?", "What is the minimal number of clues in a valid puzzle?" and "In what...

the 15 puzzle, a famous example of the sliding puzzle, can be represented by the alternating group A15, because the combinations of the 15 puzzle can be...

applications. For example, Euler's product formula, ∑ n ≥ 1 1 n s = ∏ p  prime 1 1 − p − s , {\displaystyle {\begin{aligned}\sum _{n\geq 1}{\frac {1}{n^{s}}}&=\prod...

paper award. In spring 2004, the problem appeared in Joe Buhler and Elwyn Berlekamp's puzzle column of the quarterly The Emissary of the Mathematical Sciences...

thirty-six officers problem is a mathematical puzzle with no solution. The number of possible outcomes (not summed) in the roll of two distinct dice. 36 is...

3^{2}\cdot 4^{1}.} Coincidentally, as well as being a product of descending powers, 288 is a sum of ascending powers: 288 = 1 1 + 2 2 + 3 3 + 4 4 . {\displaystyle...

and recreational mathematics, the Hanoi graphs are undirected graphs whose vertices represent the possible states of the Tower of Hanoi puzzle, and whose...

problems in more detail and lists numerous additional open problems. List of sums of reciprocals 17-animal inheritance puzzle Dick & Ogle (2018); Koshaleva...

the sum of the areas of the squares on the other two sides. The theorem can be written as an equation relating the lengths of the sides a, b and the hypotenuse...

the optimal solution for the Chinese Rings puzzle 1367 = safe prime, balanced prime, sum of three, nine, and eleven consecutive primes (449 + 457 + 461...

replaced by the sum of the square of each digit. For instance, 13 is a happy number because 1 2 + 3 2 = 10 {\displaystyle 1^{2}+3^{2}=10} , and 1 2 + 0 2 =...

grid and counting acute triangles formed from the vertices of an odd regular polygon. They equal the sums of consecutive tetrahedral numbers, and are one-fourth...

j)^{\text{th}}} entry in the product C π M {\displaystyle C_{\pi }M} is ∑ k = 1 n c i , k m k , j , {\displaystyle \sum _{k=1}^{n}c_{i,k}m_{k,j},} where...

= ∑ n = 1 ∞ 1 n s = 1 1 s + 1 2 s + 1 3 s + ⋯ {\displaystyle \zeta (s)=\sum _{n=1}^{\infty }{\frac {1}{n^{s}}}={\frac {1}{1^{s}}}+{\frac {1}{2^{s}}}+{\frac...

elements, and 209 distinct undirected simple graphs on 7 or fewer unlabeled vertices. 209 is the smallest number with six representations as a sum of three...