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# Matteo Valentinuzzi

##### Last seen: 9 days ago
415 total contributions since 2021

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Alternating sum
Given vector x, calculate the alternating sum y = x(1) - x(2) + x(3) - x(4) + ...

28 days ago

Solved

Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Given a number _n_, return the terminal value of the number chain formed by summing the square of the digits. According to the P...

28 days ago

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"Look and say" sequence
What's the next number in this sequence? * [0] * [1 0] * [1 1 1 0] * [3 1 1 0] * [1 3 2 1 1 0] This a variant on the w...

28 days ago

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Find Logic 14

28 days ago

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Find Logic 16

28 days ago

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P-smooth numbers
This Challenge is to find <https://en.wikipedia.org/wiki/Smooth_number P-smooth number> partial sets given P and a max series va...

28 days ago

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Iccanobif numbers 1
There are a lot of problems in Cody that deal with Fibonacci numbers (1, 1, 2, 3, 5, 8, 13, 21 etc...) so let's turn things arou...

28 days ago

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Amicable numbers
Test whether two numbers are <https://en.wikipedia.org/wiki/Amicable_numbers amicable>, meaning that the sum of the proper divis...

28 days ago

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Fangs of a vampire number
A <http://en.wikipedia.org/wiki/Vampire_number vampire number> is a number v that is the product of two numbers x and y such tha...

29 days ago

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Kaprekar numbers
Test if the input is a Kaprekar number: <http://mathworld.wolfram.com/KaprekarNumber.html>. Return a logical true or false. ...

29 days ago

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Woodall number
Test whether the input is a Woodall number: <http://en.wikipedia.org/wiki/Woodall_number> _Please do not cheat by simply chec...

29 days ago

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generate nth pentatope number
https://en.wikipedia.org/wiki/Pentatope_number

29 days ago

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check whether a number is a pentatope number
<https://oeis.org/A000332>

29 days ago

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Cantor counting
Find the nth cantor's rational number. the sequence is given below in the link. Sequence: 1/1,1/2,2/1,3/1,2/2,1/3,1/4... ... .....

29 days ago

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find nth even fibonacci number
1st even fibonacci number=2 ; 2nd even fibonacci number=8 ..

29 days ago

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Bell Triangle
Form the bell triangle upto nth bell number posotion; * if n=5 * y= [1 0 0 0 0; 1 2 0 0...

29 days ago

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Pell numbers
Find the nth pell number <https://en.wikipedia.org/wiki/Pell_number>

29 days ago

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Find Logic 1

1 month ago

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Find Logic 3

1 month ago

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Find Logic 4

1 month ago

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Find Logic 6

1 month ago

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Find Logic 7

1 month ago

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Find Logic 8

1 month ago

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Find Logic 9

1 month ago

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Find Logic 10

1 month ago

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Find Logic 11

1 month ago

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Find Logic 13

1 month ago

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Find Logic 12

1 month ago

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Find Logic 15

1 month ago

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Find Logic 17

1 month ago