Answer
An emirp number.
Work Step by Step
An emirp is a prime number that results in a different prime number when its decimal digits are reversed, hence the reverse of 113 is 311 which is a prime number so 113 is an emirp number.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1 - Page 256: 82
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