## Generating sexy prime pairs in Raku

This is article about programming. This solves Task 1 of the Perl Weekly Challenge 027. The so-called sexy prime pairs are pairs of prime numbers that differ by 6.

This is article about programming. This solves Task 1 of the Perl Weekly Challenge 027. The so-called sexy prime pairs are pairs of prime numbers that differ by 6.

## Computing e in Raku

How to compute the value of the mathematical constant e using recursion in the Raku programming language.

How to compute the value of the mathematical constant e using recursion in the Raku programming language.

## Cached factorial in Raku

Factorial, being a classical task for practising algorithms, is a great example to demonstrate the features of Raku. Let us update the code so that it caches the already calculated values.

Factorial, being a classical task for practising algorithms, is a great example to demonstrate the features of Raku. Let us update the code so that it caches the already calculated values.

## Implementing the Ackermann function in Raku

This is the Task 1 from the Perl Weekly Challenge Week 17. You have to implement the so-called Ackermann function.

This is an interesting function that is defined kind of recursively but actually this is not a recursion, as the recurrent formula is using the function as an argument of itself.

This is the Task 1 from the Perl Weekly Challenge Week 17. You have to implement the so-called Ackermann function.

This is an interesting function that is defined kind of recursively but actually this is not a recursion, as the recurrent formula is using the function as an argument of itself.

## Generating Niven numbers in Raku

Print all Niven number up to 50, which are the numbers which are divisible the the sum of their digits.

Print all Niven number up to 50, which are the numbers which are divisible the the sum of their digits.

## Raku challenge Week 3

Task 1. Generate a list of Regular numbers, which are the numbers, whose prime factors do not exceed 5.

Task 2. Print Pascal triangle with the given number of rows.

Task 1. Generate a list of Regular numbers, which are the numbers, whose prime factors do not exceed 5.

Task 2. Print Pascal triangle with the given number of rows.

## Raku challenges Week 2

Task 2. Convert a number to the one represented as a base-35 number and back.

Task 2. Convert a number to the one represented as a base-35 number and back.

## Raku Challenge Week 1

Task 1. Capitalise all small letters ‘e’ and count the number of replacements in the string ‘Perl Weekly Challenge.’

Task 2. Write a one-liner that, for the numbers from 1 to 20, prints ‘fizz’ if the number is divisible by 3 and ‘buzz’ if it is divisible by 5.

Task 1. Capitalise all small letters ‘e’ and count the number of replacements in the string ‘Perl Weekly Challenge.’

Task 2. Write a one-liner that, for the numbers from 1 to 20, prints ‘fizz’ if the number is divisible by 3 and ‘buzz’ if it is divisible by 5.

## Combinations in Raku

Monday morning, and there are new tasks in the new weekly challenge 067. Both of them require similar Raku tools, namely, the cross operator X.

Monday morning, and there are new tasks in the new weekly challenge 067. Both of them require similar Raku tools, namely, the cross operator X.

## Collatz Conjecture in Raku

An interesting task offered on Week 54 of the Perl Weekly Challenge: Print the Collatz Conjecture for the given integer number. The conjecture is that for any starting number, the sequence ends with 1.

An interesting task offered on Week 54 of the Perl Weekly Challenge: Print the Collatz Conjecture for the given integer number. The conjecture is that for any starting number, the sequence ends with 1.

## More Raku challenges

Task 1: Find the first 20 so-called Gapful numbers. Task 2: Print all palindromic ddmmyyyy dates between 2000 and 3000. Task 3: Find the first multiple of the given number, which only contains digits 0 and 1.

Task 1: Find the first 20 so-called Gapful numbers. Task 2: Print all palindromic ddmmyyyy dates between 2000 and 3000. Task 3: Find the first multiple of the given number, which only contains digits 0 and 1.

## Programming challenge: insert signs between digits

Here’s another drill offered by the Perl Weekly Challenge on Week 44. The task is to get a string 123456789 and insert the signs + and – between the digits so that the evaluated value of the new string equals 100.

Here’s another drill offered by the Perl Weekly Challenge on Week 44. The task is to get a string 123456789 and insert the signs + and – between the digits so that the evaluated value of the new string equals 100.

## Practicing Raku challenges

A few Raku challenges solutions: printing arrays, generating Leonardo numbers, converting to octals.

A few Raku challenges solutions: printing arrays, generating Leonardo numbers, converting to octals.

## On Perl 7

A couple of days ago, Perl 7 was announced.

Isn’t that a great news? Well, yes and no. I have my personal feelings about this but I hope I can also see some other things that are not so much subjective.

A couple of days ago, Perl 7 was announced.

Isn’t that a great news? Well, yes and no. I have my personal feelings about this but I hope I can also see some other things that are not so much subjective.

## Check if the number can be represented as a power of integers

In the second task of this week’s Challenge, you have to find two integers that being powered as xy, give the requested integer number n.

In the second task of this week’s Challenge, you have to find two integers that being powered as xy, give the requested integer number n.

## Raku string vs integer practices

Hey there, there’s another task #066-1 offered by the Perl Weekly Challenge (why still not mentioning Raku in the name?).

Integer-divide the two given integers, \$m and \$n, without using multiplication, or division, or modulo.

Hey there, there’s another task #066-1 offered by the Perl Weekly Challenge (why still not mentioning Raku in the name?).

Integer-divide the two given integers, \$m and \$n, without using multiplication, or division, or modulo.

## My English articles about wavelets

The PDFs of the articles about using wavelets that my thesis supervisor, my co-authors and I wrote in late 1990s and early 2000s in English.

The PDFs of the articles about using wavelets that my thesis supervisor, my co-authors and I wrote in late 1990s and early 2000s in English.

## Raku daily skill builders

Here is my Raku solution of the Task 1 on Week 65. The task is to print all \$n-digit numbers, whose sum of digits is \$s.

Here is my Raku solution of the Task 1 on Week 65. The task is to print all \$n-digit numbers, whose sum of digits is \$s.

## Another Raku one-liner

Let me demonstrate another interesting one-liner that I find to be a good addition to my last years’s book Raku One-Liners. The task was inspired by this week’s problem from the Perl Weekly Challenge.

Let me demonstrate another interesting one-liner that I find to be a good addition to my last years’s book Raku One-Liners. The task was inspired by this week’s problem from the Perl Weekly Challenge.