This is a student solutions manual for Elementary Number Theory with Applications 1st edition by Thomas Koshy ‎(‎2002‎)‎‎.‎ Note that the textbook itself is not included in this purchase‎.‎ From the back cover of the textbook‎:‎ Modern technology has brought a new dimension to the power of number theory‎:‎ constant practical use‎.‎ Once considered the purest of pure mathematics‎,‎ number theory has become an essential tool in the rapid development of technology in a number of areas‎,‎ including art‎,‎ coding theory‎,‎ cryptology‎,‎ and computer science‎.‎ The range of fascinating applications confirms the boundlessness of human ingenuity and creativity‎.‎ Elementary Number Theory captures the author‎'‎s fascination for the subject‎:‎ its beauty‎,‎ elegance‎,‎ and historical development‎,‎ and the opportunities number theory provides for experimentation‎,‎ exploration‎,‎ and‎,‎ of course‎,‎ its marvelous applications‎.‎