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51 is not a Prime number as it is divisible by 3. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.
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Write a unix shell program to print the prime numbers?
i=2 rem=1 echo "Enter a number" read num if [ $num -lt 2 ] then echo "$num is not prime" exit 0 fi while [ $i -le `expr $num / 2` -a $rem -ne 0 ] do rem=`expr $num % $i` i=`expr $i + 1` done if [ $rem -ne 0 ] then echo "$num is prime" else echo "$num is not prime" fi
How do you write a c program to find prime numbers between 1 to 10000 using functions?
You need two utility functions. The first determines if a given number is prime or not. The second finds the next prime after a given number. The following function can be used to determine if a given integer is prime: bool is_prime (const unsigned num) { if (num<2) return false; if (0==(num%2)) return num==2; unsigned max_factor = (unsigned) sqrt ((double) num) + 1; unsigned factor; for (factor=3; factor<max_factor; ++factor) if (0==(num%factor)) return false; return true; } The following function can be used to determine the next prime after the given integer: unsigned next_prime (unsigned num) { while (!is_prime (++num)); return num; } Now you can print a series of primes using the following: int main (void) { unsigned num=1; while (num<10000) { num = next_prime (num); printf ("%d is prime\n", num); } return 0; }
Is 5 a prime num ber?
YES 5 is a prime number!
Are 31 and 51 prime numbers?
31 is prime, but 51 is not as 51=3*17.
Which is not a prime number 17 23 31 or 51?
51 is not a prime number: 3x17=51
