Prime Coding
Prime Coding maps each letter to a prime number. The most common scheme assigns the first prime (2) to A, second prime (3) to B, third prime (5) to C, and so on. Words become sequences of prime numbers. These problems test knowledge of prime numbers and mapping skills.
What You'll Learn
Introduction to Prime Coding
Prime Coding maps each letter to a prime number. The most common scheme assigns the first prime (2) to A, second prime (3) to B, third prime (5) to C, and so on. Words become sequences of prime numbers. These problems test knowledge of prime numbers and mapping skills.
Prerequisites
How to Solve Prime Coding Problems
Step 1: Identify the mapping scheme (A=2, B=3, C=5, ...)
Step 2: For each letter, find its position (A=1, B=2, ..., Z=26)
Step 3: Find the prime number at that position in the prime sequence
Step 4: Write the prime numbers in the same order as the letters
Step 5: For decoding, find which letter corresponds to each prime
Step 6: Verify the mapping is consistent
Step 7: Present the coded prime sequence or decoded word
Example Problem
Example: Code 'BAD' using prime coding (A=2, B=3, C=5, ...). Solution: Step 1: A=1st prime=2, B=2nd prime=3, D=4th prime=7 Step 2: B=3, A=2, D=7 Step 3: Code = 3,2,7 Answer: 3,2,7
Pro Tips & Tricks
- First 26 primes: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101
- A=2, B=3, C=5, D=7, E=11, F=13, G=17, H=19, I=23, J=29, K=31, L=37, M=41
- N=43, O=47, P=53, Q=59, R=61, S=67, T=71, U=73, V=79, W=83, X=89, Y=97, Z=101
- Prime numbers (except 2) are odd, so most codes will be odd
- The product of prime codes is unique (fundamental theorem of arithmetic)
- For decoding, check if the prime is in the list of first 26 primes
Shortcut Methods to Solve Faster
Common Mistakes to Avoid
Practice Worksheets
Practice makes perfect! Work through these worksheets to master Prime Coding. Each worksheet contains 20 questions with detailed explanations. Start from Worksheet 1 and progress through increasing difficulty levels.
Ready to Master Prime Coding?
Start with Worksheet 1 and work your way up to expert level! Each worksheet includes: