# Rafael S.T. Vieira

Computer Scientist in love with Computer Graphics.

**Programming Languages:**

Python, C, Java, PHP, Javascript, MATLAB, SQL, HTML, CSS, Arduino, Shell

**Spoken Languages:**

English, French, Portuguese

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**Content Feed**

Solved

Find numbers in the Popular Computing Z-sequence

Here’s a quick one. In 1977 the magazine Popular Computing sought “problem situations for which the computer is the best (if not...

3 hours ago

Solved

Determine whether a number is a fibodiv number

The number 14 is a fibodiv number because you can divide it into 1 and 4, use those numbers as the seeds for a Fibonacci sequenc...

3 hours ago

Solved

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...

4 hours ago

Solved

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...

1 day ago

Solved

Compute the Sequence of the Day

A sequence starts with 1 and 2, and each subsequent term is the sum of the digits of the product of the previous two terms. As a...

1 day ago

Solved

List the dopey numbers

If vile numbers have binary representations that end with an even number of zeros (even vile), then numbers with binary represe...

1 day ago

Solved

List the vile numbers

Evil numbers, the subject of Cody Problem 2733 have an even number of ones in their binary representations, whereas odious numbe...

1 day ago

Solved

Sum the elements in rows of the Levine triangle

The Levine triangle starts as follows: Row 0: 2 Row 1: 1 1 Row 2: 1 2 Row 3: 1 1 2 To construct each row, r...

1 day ago

Solved

Find the smallest integer m such that n divides m!

Write a function that takes an integer and finds the smallest integer whose factorial is divisible by . For example, if , then...

1 day ago

Solved

Find the nth nude number

The number 672 is a nude number because it openly displays three of its divisors: 6, 7, and 2. In other words, a nude number is ...

1 day ago

Solved

Acid and water

⚖ ⚖ ⚖ ⚖ ⚖ ⚖ ⚖ ⚖ Assume that there is a 100 liter tank. It is initially fi...

1 day ago

Solved

Easy Sequences 24: Number of Coprime Lattice Points

Given a number 'n', you were tasked to mark and count all coprime lattice points at the first quadrant bounded by the points (0,...

2 days ago

Solved

Easy Sequences 27: Product of Radicals of Integers

The radical of a positive integer is defined as the product of the distinct prime numbers dividing . For example, the distinct ...

2 days ago

Solved

Easy Sequences 28: Sum of Radicals of Integers

The radical of a positive integer is defined as the product of the distinct prime numbers dividing . For example, the distinct ...

2 days ago

Solved

Easy Sequences 31: N-N's Sequence

We define the N-N's Sequence, as the series of all positive integers in ascending order and with repetition, wherein any number ...

3 days ago

Solved

Easy Sequences 25: Product of Series

The function 'P(n)' is defined as the series product: where 'T(n)' is the triangular sum: ...

3 days ago

Solved

Easy Sequences 21: Combinatorial Summations

Create the function S(n), defined by the following summation: The symbol is the combination f...

3 days ago

Solved

Easy Sequences 18: Set Bits of Triple Summations

The function S(n) is defined by the following triple summations: The double brackets mean that th...

4 days ago

Solved

Easy Sequences 16: Volume of Embedded Octahedron

An octahedron (not regular) is formed by joining the centers of the faces of a rectangular parallelepiped (see below figure). ...

4 days ago

Solved

Easy Sequences 13: Average Speed of Spaceship

A certain alien spaceship is capable of traveling at extremely high velocities and is able to change speed instantaneously. The ...

4 days ago

Solved

Redefine the Array if the Elements in the Array are Repeating

Check if the Array has any repeating elements, if there are repeating elements then choose "n" as a number of times you want tha...

7 days ago

Solved

Acid-Base Chemistry: Which side of the reaction is more favorable?

In an Acid-Base reaction, there is always going to be an acid, a base, a conjugate acid, and a conjugate base. When provided wit...

7 days ago

Solved

Construct the Seidel-Entringer-Arnold triangle

Several problems in Cody ask us to construct part or all of triangles in which entries follow a pattern. Cody Problems <https://...

7 days ago