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How many prime numbers are there whose square has 5 or 6 digits?
Wiki User
∙ 10y ago
solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.
Wiki User
∙ 10y ago
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What is the largest and smallest of two-digit prime numbers whose digits are also prime digits themseleves?
Smallest is 11 & Largest is 77.
What is largest two digit prime numbers whose digits are also prime?
73 satisfies your condition.
What is the smallest two digit prime number whose digits themselves are prime?
The smallest two-digit prime number whose digits themselves are prime is 23. Both 2 and 3 are prime numbers, and together they form the prime number 23.
What are all the two digit prime numbers neither of whose digits are prime?
11, 19, 41, 61, and 89
What 2-digit prime number has a sum of 10 when you add up its digits?
Two-digit prime numbers whose digits add up to 10 are:193773
What is the largest and smallest of two-digit prime numbers whose digits are also prime digits themseleves?
Smallest is 11 & Largest is 77.
What is largest two digit prime numbers whose digits are also prime?
73 satisfies your condition.
What is the smallest two digit prime number whose digits themselves are prime?
The smallest two-digit prime number whose digits themselves are prime is 23. Both 2 and 3 are prime numbers, and together they form the prime number 23.
What are all the two digit prime numbers neither of whose digits are prime?
11, 19, 41, 61, and 89
What 2-digit prime number has a sum of 10 when you add up its digits?
Two-digit prime numbers whose digits add up to 10 are:193773
How many two digit numbers have digits whose sum is a perfect square?
69
How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?
There are four pair of mirror primes.
What is a mirror prime number and do both numbers have to be prime in the answer and what are the mirror primes from 1-100?
Mirror primes are pairs of prime numbers whose digits are reversed. (13,31)(17,71)(37,73)(79,97)
You are a prime number you have two digits The sum of your digits are 17 what number are you?
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.
Is 518 a composite number or a prime number?
It is composite, as are all whole numbers whose last digits are even.
What numbers can be mistakenlyidentified as prime?
numbers that do not end in 0, 2, 4, 5, 6 or 8; numbers whose digits do not total 3 or a multiple of 3
What is the smallest two-digits prime number whose digits are also prime themselves?
23
