LeetCode:
I am currently working through several collections of challenges (Leetcode75, Pandas30, SQL50) to develop my programming skills. You can check my progress here.

ProjectEuler Solutions:
Similarly, ProjectEuler.net has a huge range of maths problems to solve, including:

179 - Consecutive Positive Divisors - Finding consecutive pairs of numbers between 1-10000000 which have the same number of factors?

104 - Pandigital Fibonacci Ends - What is the index of the first Fibonacci number in which both the first 9 digits and the last 9 digits contain the digits 1-9?

102 - Triangle Containment - Given a list of 3 vertices of a triangle, how many of these triangles would contain the coordinate (0,0)?

92 - Square Digit Chains - How many starting numbers below 10,000,000 produce a certain number chain?

42 - Coded Triangle Numbers - How many triangle words exist in a given file?

35 - Circular Primes - How many circular primes are there below 1,000,000?

25 - 1000th Digit Fibonacci Number - What’s the first fibonacci number to contain 1000 digits?

11 - Greatest Product - Greatest product of 4 adjacent numbers in a 20x20 grid

Other:
Arithmetic Sequences using 0-9 digits - Using the digits 0-9, form five two-digit numbers that form an arithmetic sequence. Find the sum of the numbers in all the possible arithmetic sequences that can occur.

The Comma Sequence - Exploring this amazing sequence, starting: 1,12, 34, 94…

Consecutive Semi Primes - Find 3 consecutive semi-prime numbers

Common Factors - I already knew that the probably that two randomly chosen numbers have a common factor is 6/𝜋^2. However, I wanted to program this to check for myself.

Vowel Count in a Sentence - This function counts the number of vowels in a sentence.

Reverse Letters - This function reverse the letters of every word in a sentence.

Longest Chain - One of my colleagues gave me this problem recently: Choose a starting number. If the number is even then divide it by two or, if it’s odd then add one. Stop when you get to one. What’s the longest chain you can make?

Binary and Decimal Conversion - Converting Binary and Decimal numbers functions