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MATH 437/537 HOMEWORK 3
发布时间:2022-11-14
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HOMEWORK 3: DUE NOVEMBER 11TH
MATH 437/537
Problem 1 . (14 points.) Let f (x) e 勿[x] be the polynomial
f (x) := x8 _ x7 + x5 _ x4 + x3 _ x + 1.
Prove that for each integer n > 1, we have that
n | f /35n _1、.
Problem 2. (5 points.) Let p and q be prime numbers larger than 4. Show that there exists an integer a > 1 with the property that
either p | 2p _ aq
or q | 2q _ ap .
Problem 3. (6 points.) Find a multiplicative function f : N _→ N with the property that there are no solutions in positive integers a, b, c, d to the equation
f (a) + f (b) + f (c) = f (d),
but on the other hand, for each positive integer n 3, there exist infinitely many solutions in positive integers to the equation
f (x1 ) + f (x2 ) + . . . + f (xn ) = f (xn+1).
Problem 4 . (5 points.) Prove or disprove the following statement: there exists no multiplicative function f : N _→ N with the property that for each k e N, the following holds:
nk
n →( f (n)