Advertisements
Advertisements
प्रश्न
For which of the numbers, from n = 2 to 8, is 2n − 1 a prime?
बेरीज
उत्तर
| n | 2n − 1 | Result | Prime/Not Prime |
| 2 | 2 × 2 − 1 = 4 − 1 | 3 | Prime |
| 3 | 2 × 3 − 1 = 6 − 1 | 5 | Prime |
| 4 | 2 × 4 − 1 = 8 − 1 | 7 | Prime |
| 5 | 2 × 5 − 1 = 10 − 1 | 9 | Not prime |
| 6 | 2 × 6 − 1 = 12 − 1 | 11 | Prime |
| 7 | 2 × 7 − 1 = 14 − 1 | 13 | Prime |
| 8 | 2 × 8 − 1 = 16 − 1 | 15 | Not prime |
For n = 2, 3, 4, 6 and 7 it is prime.
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
What are prime numbers? Give ten examples.
Make a list of seven consecutive numbers, none of which is prime.
Give examples of five pairs of co-primes.
Are co-primes always primes? If no, illustrate your answer by an example.
Express the following number as the sum of twin prime:
120
State the following statement as True or False.
If two numbers are co-primes, at least one of them must be a prime number.
Every counting number has an infinite number of
The number of prime numbers between 11 and 60 is _________
The Sum of two prime numbers is always even.
2 is the only even prime number.
