15. Find x in the adjoining figure:
of getting not a prime number
700
600
Answers
Answer:
Step-by-step explanation:
Now, let us see here the list of prime numbers starting from 1 to 1000. Since 1 is not a prime number, as it has only one factor, therefore, we will start the list from 2.
Numbers
Number of prime numbers
List of prime numbers
1 to 100
25 numbers
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
101-200
21 numbers
101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199
201-300
16 numbers
211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293
301-400
16 numbers
307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397
401-500
17 numbers
401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499
501-600
14 numbers
503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599
601-700
16 numbers
601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691
701-800
14 numbers
701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797
801-900
15 numbers
809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887
901-1000
14 numbers
907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997
Total number of prime numbers (1 to 1000) = 168
Hence, in the above given list, the numbers provided are all prime numbers. We can cross check with any of these numbers to know if they are prime or not, by factorising them.
For example:
709 = 1 x 709, only two factors
911 = 1 x 911, only two factors
401 = 1 x 401, only two factors
Therefore, this way we can find all the prime numbers.
Read more:
Prime Factorization
Prime Factors