Using Eulers Thm find, 15597 mod 153

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Using Eulers Thm find, 15597 mod 153

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Euler's theorem is very significant in congruence. For two relatively prime integers a and n, in view of this theorem, aφn1mod n

Here, φn is the Euler's phi function. It denotes the number of positive integers less than and relatively prime to n. When p is a prime, in that case, for all integer k1

φpk=pk-pk-1φp=p-1

Then, Euler's theorem becomes ap-11mod p

This is the statement of Fermat's little theorem. 

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