Answer
Let $a=10$ and $b=1$.
Work Step by Step
Letting $a=10$ and $b=1$ means the decimal representation ends in n, as $10n$ always ends in 0. By Dirichlet's theorem, then, there are infinitely many primes in this arithmetic progression.
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 4 - Section 4.6 - Cryptography - Supplementary Exercises - Page 308: 17
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