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how many two-digit primes have

This is a riddle, and I'm supposed to find a 5-digit number from it.....My thousand's digit is the first that is perfect, but if
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2. asked by Catherine
3. 685 views
This is a riddle, and I'm supposed to find a 5-digit number from it.....My thousand's digit is the first that is perfect, but if
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2. asked by Peter
3. 1,145 views
The digits 1,2,3,4,5,6,7,8,9 are used to form four two-digit prime numbers, with each digit used exactly once. What is the sum
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2. asked by ooooookkkkkk
3. 820 views
how many two-digit primes have a ones digit of 1????????????????????got no clue
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2. asked by amad
3. 4,554 views
URGENT HELP!Squares into PrimesSome primes can be expressed as the sum of two squares, as in 13=2^2+3^2; some can't:7=/=a^2+b^2.
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2. asked by Sara
3. 1,224 views
For how many two-digit primes is the sum of the digits equal to 8?
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2. asked by Ella
3. 1,091 views
what percent of the two digit whole numbers are primes ?1.21 2.23 3.25 4.29? explain the ans
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2. asked by tasu
3. 390 views
Two consecutive odd primes, such as 11 and 13, are called a pair of "twin primes" how many pairs of twin primes are there
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2. asked by anonymous1
3. 1,366 views
three consecutive primes are summed. when the sum is squared, the result is 72,361. what is the largest of the three primes?
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2. asked by shaun
3. 2,832 views
Two of the many conjectures involving primes are given in exercises 36 and 37.36. The mathematician Christian Goldbach
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2. asked by Kyleigh
3. 86 views