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HEHarrison Ezeharystyles.hashnode.devFeb 10 · 29 min read

Comprehensive Cryptography Notes for Beginners

Part 1: Encoding and Decoding What is Encoding? Encoding is the process of converting data from one format to another. It's about representation, not security. Think of it like translation: you're changing the language, but the message is still reada...

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AHAnni Huanghuanganni.hashnode.devJul 13, 2025 · 5 min read

LeetCode 204 Count Primes - Sieve of Eratosthenes Solution (Med, Java, O(n√n))

Problem Description LeetCode 204 Count Primes Given an integer n, return the number of prime numbers that are less than n. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. For example, if n = ...

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AHAnni Huanghuanganni.hashnode.devJul 13, 2025 · 2 min read

LeetCode 264 Ugly Number II - Two approaches(Med, Java, O(n))

Problem Overview LeetCode 264 Ugly Number II An ugly number is a positive integer whose prime factors are limited to 2, 3, and 5. The sequence starts: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12... Solution 1: Dynamic Programming with Three Pointers (Recommende...

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TBTech Beastztechbeast.hashnode.devApr 11, 2025 · 2 min read

The Smart Home: Ready for prime time?

Remember when home automation felt like something straight out of a sci-fi movie? Well, those days are long gone! Smart devices have gone mainstream, and they're changing the way we live, sometimes in ways we might not even realize. Here's a peek ...

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PCPriya Chakrabortypriyachakraborty.hashnode.devJun 17, 2023 · 1 min read

DAY 11 of PYTHON top 100 questions : from Basic to Advanced !!

Write a Python program to check whether a given number is a prime number or not:- num = int(input("Enter a number: ")) result = "" i = 2 while i * i <= num: if num % i == 0: result = "not " break i += 1 if num < 2 or result...

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RPRajganesh Panduranganblog.bhuvanpati.comJan 16, 2023 · 2 min read

Prime Numbers: What They Are and Why They Matter

Prime numbers have captivated mathematicians for centuries. They’re so simple yet so important—they’re used in cryptography, coding, computer science, and much more. In this blog post, we’ll explore what prime numbers are, why they’re important, and ...

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#prime

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Trending tags this week

Comprehensive Cryptography Notes for Beginners

LeetCode 204 Count Primes - Sieve of Eratosthenes Solution (Med, Java, O(n√n))

LeetCode 264 Ugly Number II - Two approaches(Med, Java, O(n))

The Smart Home: Ready for prime time?

DAY 11 of PYTHON top 100 questions : from Basic to Advanced !!

Prime Numbers: What They Are and Why They Matter