6. Show that ifn = pq, a product of distinct primes, then a (n)+1 (mod n) for all a. = a

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Can you do #6
roc
(a) 3340 mod 341
mu
(b) 78° mod 100
hav
r1)
(c) 210000 mod 121
but
! 2. Implement the algorithm for exponentiation modulo m on a compuer Use
this to check the result of Exercise 41.1.
non
com
3. Use Euler's Theorem (and the Chinese Remainder Theorem) to sho that
n1? = 1 (mod 72) for all (n, 72) = 1.
Rem
mia
4. What is the smallest positive integer A such that n^ = 1 (mod 100) for all
(n, 100) = 1?
has
f (x
the c
5. Prove that m (m) + n°(m) = 1 (mod mn) if (m, n) = 1.
6. Show that ifn = pq, a product of distinct primes, then a$(n)+1
(mod n) for all a.
= a
The
polyr
T
= 1. Show that
od
7. Suppose that n = rs withr > 2, s > 2 and (r, s) :
р.
$(n)
(r)6(s)
a
=1 (mod n), that is, a^´ = 1 (mod n).
comp
8. Suppose n is the product of two odd primes, p and q. Let
PROC
X(n) = (p – 1)(q – 1)/(p – 1, q – 1).
If f i
Show that a^(n) =1 (mod n) for all integers a, satisfying (a, n) = 1.
ах +
no sol
have t
9. Use a computer to find the composite numbers n < 2000 such that 2" =
2 (mod n). Repeat the exercise to find composite n such that 3" = 3
(mod n).
No
whose
Let f(
has no
10. Prove that a560 = 1 (mod 561) for all (a, 561) = 1.
11. Suppose a² = 1 (mod m) and aº = 1 (mod m); show that a(¤;y) = 1
(mod m).
for pol
12. Determine whether the following integers are prime powers, and if so, find
the prime power decomposition.
(a) 24137569
that is,
(b) 500246412961
No
Therefo
(c) 486695567
at most
divisible
Suppose
Transcribed Image Text:roc (a) 3340 mod 341 mu (b) 78° mod 100 hav r1) (c) 210000 mod 121 but ! 2. Implement the algorithm for exponentiation modulo m on a compuer Use this to check the result of Exercise 41.1. non com 3. Use Euler's Theorem (and the Chinese Remainder Theorem) to sho that n1? = 1 (mod 72) for all (n, 72) = 1. Rem mia 4. What is the smallest positive integer A such that n^ = 1 (mod 100) for all (n, 100) = 1? has f (x the c 5. Prove that m (m) + n°(m) = 1 (mod mn) if (m, n) = 1. 6. Show that ifn = pq, a product of distinct primes, then a$(n)+1 (mod n) for all a. = a The polyr T = 1. Show that od 7. Suppose that n = rs withr > 2, s > 2 and (r, s) : р. $(n) (r)6(s) a =1 (mod n), that is, a^´ = 1 (mod n). comp 8. Suppose n is the product of two odd primes, p and q. Let PROC X(n) = (p – 1)(q – 1)/(p – 1, q – 1). If f i Show that a^(n) =1 (mod n) for all integers a, satisfying (a, n) = 1. ах + no sol have t 9. Use a computer to find the composite numbers n < 2000 such that 2" = 2 (mod n). Repeat the exercise to find composite n such that 3" = 3 (mod n). No whose Let f( has no 10. Prove that a560 = 1 (mod 561) for all (a, 561) = 1. 11. Suppose a² = 1 (mod m) and aº = 1 (mod m); show that a(¤;y) = 1 (mod m). for pol 12. Determine whether the following integers are prime powers, and if so, find the prime power decomposition. (a) 24137569 that is, (b) 500246412961 No Therefo (c) 486695567 at most divisible Suppose
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