So we made a calculator app that carries out any arithmetic operation, including: listing even numbers between a given range, listing odd numbers between a given range, verifying a prime number, listing prime numbers between a given range, finding the factors of a number, finding the prime factors of a number, finding highest common factor (H.C.F.) of a set of numbers, and finding lowest common multiple (L.C.M.) of a set of numbers; showing all the steps followed.