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**Content Feed**

Solved

That's not my hat!

There exists a highly secretive hat consortium. Members possess identical hats. The members are invited to a meeting. All of the...

17 hours ago

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List the Euclid numbers

Euclid proved that the number of primes is infinite with the following argument. Suppose the primes form a finite set , , . Comp...

3 days ago

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Evaluate the Kelvin functions

The Kelvin functions ber, bei, ker, and kei are related to Bessel functions of order . When the order is not specified, the defa...

3 days ago

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prime consecutive sums

Create a number sequence of 1 to n, such that the sums of every two consecutive numbers are all primes. E.g. if n = 5, you may ...

22 days ago

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Fill a rectangle with 1x1 and 2x2 tiles

A 3x2 rectangle can be filled with 1x1 and 2x2 tiles in three ways: The colors merely distinguish the sizes of the tiles. A 3...

24 days ago

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Compute a determinant

Write a function to compute the determinant of an x matrix with diagonal entries equal to an integer and other entries equal ...

24 days ago

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Get twenty-four

Inpur four integers in 1 to 10, you may use plus, minus, multiply and divid to get 24. Note that every integer should be used on...

29 days ago

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Palindrome Problem 1

Continued Problem 50033: A palindrome is one-thirteenth of the sum of and , where and are also palindrome. Give an example o...

29 days ago

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Concatenate input positive integers to obtain a maximum.

Input some integers, you need to concatenate them to obtain a maximum integer. Neither use library function "perms" to list all ...

1 month ago

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N-th Digit of all Write-Down Numbers

Write-Down Numbers are: 123456789101112131415161718192021222324252627282930... What is the N'th digit (where N is represented a...

1 month ago

Solved

n-th digit of write-down all numbers

Write down number as 123456789101112131415161718192021222324252627282930... what's the n-th digit? input n and get the digit.

1 month ago

Solved

Evaluate Poker Hand

Given an input table of card values and card suits between five and thirteen cards, choose the best five cards and output the ra...

1 month ago

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Determine Poker Hand Winner

Determine the poker hand winner from two hands of cards (each hand will contain the same number of cards between five and thirte...

1 month ago

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Draw the symbol '+'

Draw '+' in an x-by-x matrix (where x is odd and x >3) Example: x = 5 y = [0 0 1 0 0 0 0 1 0 0 1 1 1 1 1 0 ...

2 months ago

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Determining if a Degree Sequence is Potentially a Graph

A degree sequence is a list of numbers representing the degrees of vertices in a graph. While it is difficult to tell if a graph...

2 months ago

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Check if a matrix Diagonal is equal to its secondary diagonal

Your function should return True if the secondary diagonal is equal to diagonal, and False otherwise. Eg: M = [1 2 1 ...

2 months ago

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Area of a regular hexagon

Given the length of a side of a regular hexagon, return its area rounded to two decimal places.

2 months ago

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Create the Ulam spiral

Have you ever seen this wonderful spiral ? The Ulam Spiral is arranging prime numbers in a clockwise spiral starting in 0. Give...

3 months ago

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Ramanujan's Number

About 1729 1729 is the first positive integer which can be expressed as the sum of two positive cubes in two different ways. ...

3 months ago

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Add the number of horizontal and vertical movements to each matrix element

Given n, create a square matrix and with element (1,1) = 1, add 1 to each element for each horitizonal and vertical movement. E...

3 months ago

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Draw 'Y'

Draw 'Y' in an x-by-x matrix (where x is odd and x >= 3) Examples: x = 3 y = [1 0 1 0 1 0 0 1 0] x = 5 y = [1...

3 months ago

Solved

Matrix rotation

You are given a 2D matrix of dimension [m,n] and a positive integer r. You have to rotate the matrix r times and print the resul...

3 months ago

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Circle Division

A circle can be divided into 2 sections, by placing 2 points in arbitrary locations along its circumference and drawing a straig...

3 months ago

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Solve an ODE: first-order linear equation

In the fall semester of [redacted], my professor for a course on ordinary differential equations said, “There are two groups of ...

3 months ago

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Classify product/digit-sum sequences

Cody Problem 53120 involved a sequence in which a term is computed by multiplying the previous two terms and adding the digits o...

3 months ago

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Solve an ODE: nonlinear third-order equation

Write a function to solve the ordinary differential equation on the domain with , , and either or . The input variable ord ...

3 months ago

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Check whether a Wordle guess is consistent with previous feedback

The game Wordle resembles the classic game Mastermind. Players try to guess a five-letter word, and after each guess they are to...

3 months ago

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Create a secure password

You are joining the MATLAB Central platform to solve a question on Cody. The signup page requires you to input an id and a passw...

4 months ago

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Easy Sequences 65: Fractional Part of Square Roots

The fractional part function of a positive real number , denoted as , is defined as: , where , is the 'floor' of . Thus, , and ...

4 months ago

Solved

Easy Sequences 64: Base-14 Arithmetic Function

For an integer , the base-14 arithmetic function, , is defined as follows: Convert to base-14, using the letters '' for digits...

4 months ago