3 and 5
1,2,5,10
No
By dividing it by the prime factors that have no remainders
16 has only one prime factor and it is 2
2 and 3
1, 3, 11, 33 3 and 11 are prime.
No, 703 is not a prime number.____________________________________________Improved:703 is not a primeFactors of 703 are 1, 19, 37, and 703.
90 = 2 x 3 x 3 x 5 = 2 x 32 x 5
import java.io.*; class PrimeFactors { private boolean prime(int a) { boolean b=true; for(int i=2;i<=(a/2);i++) { if(a%i==0) b=false; } return b; } protected static void main()throws IOException { BufferedReader in=new BufferedReader(new InputStreamReader(System.in)); System.out.print("Enter the Number: "); int a=Integer.parseInt(in.readLine()); PrimeFactors o=new PrimeFactors(); System.out.println("Prime Factors of "+a+" are::"); for(int i=1;i<=(a/2);i++) { if(a%i==0) { boolean b=o.prime(i); if(b==true) System.out.print(i+" "); } } }}
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For 15:0 * 15 = 01 * 15 = 152 * 15 = 303 * 15 = 454 * 15 = 605 * 15 = 756 * 15 = 907 * 15 = 1058 * 15 = 1209 * 15 = 13510 * 15 = 15011 * 15 = 16512 * 15 = 18013 * 15 = 19514 * 15 = 21015 * 15 = 22516 * 15 = 24017 * 15 = 25518 * 15 = 27019 * 15 = 28520 * 15 = 30021 * 15 = 31522 * 15 = 33023 * 15 = 34524 * 15 = 36025 * 15 = 37526 * 15 = 39027 * 15 = 40528 * 15 = 42029 * 15 = 43530 * 15 = 450For 25:0 * 15 = 01 * 15 = 252 * 15 = 503 * 15 = 754 * 15 = 1005 * 15 = 1256 * 15 = 1507 * 15 = 1758 * 15 = 2009 * 15 = 22510 * 15 = 25011 * 15 = 27512 * 15 = 30013 * 15 = 32514 * 15 = 35015 * 15 = 37516 * 15 = 40017 * 15 = 42518 * 15 = 45019 * 15 = 47520 * 15 = 50021 * 15 = 52522 * 15 = 55023 * 15 = 57524 * 15 = 60025 * 15 = 62526 * 15 = 65027 * 15 = 67528 * 15 = 70029 * 15 = 72530 * 25 = 750
15, 30, 45, 60, 7515x1=1515x2=15+15=3015x3=15+15+15=4515x4=15+15+15+15=6015x5=15+15+15+15+15=75The first 5 multiples of 15 are:15,30,45,60,75