Q. When 2256 is divided by 17 the remainder would be
Modular Exponentiation Concept: We will use the concept of modular exponentiation to find the remainder when 2256 is divided by 17. This concept states that if we want to calculate abmodm, we can break this down into smaller powers of a and repeatedly apply the modulus to keep the numbers small.
Finding Remainder for 2256: First, we find the remainder when 2 is raised to a power and divided by 17. We start with small powers of 2.21mod17=222mod17=424mod17 can be found by squaring the result of 22mod17.(22mod17)2=42=16mod17=16
Calculating Small Powers of 2: We continue by finding 28mod17, which is the square of 24mod17. (24mod17)2=162mod17 To calculate this, we can first find 162=256 and then take this modulo 17. 256mod17=0 (since 256 is a multiple of 17)
Finding 28mod17: Knowing that 28mod17=0, we can find 216mod17 by squaring the result of 28mod17. (28mod17)2=02=0mod17
Finding 216mod17: Now, we can express 2256 as (216)16. Since we know that 216mod17=0, raising this to any power will still result in 0mod17.(216mod17)16=016=0mod17
Correcting Previous Error: However, we made a mistake in the previous steps. 28mod17 is not 0, and therefore, 216mod17 is not 0 either. We need to correct this error and re-calculate the correct remainders.
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