# Yahoo Web Search

1. ### How to memorize the first 25 prime numbers fast?

... primes must end in 1 , 3, 7, or 9. (..., and if the sum is divisible by... the only other prime less than √ 100 = 10, that's all you have left to eliminate, because any...already stricken from the list), because any...

3 Answers · Science & Mathematics · 04/10/2012

2. ### Prime number confusion - Algebra.?

...0 for any b in the range 1 to 100 , so this case doesn't work...3 + y^3 must be a positive prime . 2) If a is prime then a^2 - 1 = 3b, so (a - 1 )(a + 1 ) = 3b... primes except 3. So the sum of all a = sum of all primes ...

2 Answers · Science & Mathematics · 20/07/2013

3. ### maths puzzles:if 1 +3+5+7+9+11+13+15+17+19= 100 then how i can make sum of 50 by taking only 5 numbers form it?

...you can take away 100 and four ...and 19 -- for a sum of 50 -- say, 1 + 3 + 7 + 11...you were to take away the digit " 1 " from each of the numbers 11, 13, 15, 17...the first prime summand." "...

2 Answers · Science & Mathematics · 27/03/2010

4. ### the number of prime numbers less than 1 lakh whose digital sum is 2(digital sum ofanumberisthesumofitsdigits)?

...this choice is different from others. You...that most people say that the prime nos. less than 1 lakh (or 100 thousand) whose digital sum is 2 are 11...have tried extensively to find them and check...

4 Answers · Science & Mathematics · 09/10/2006

5. ### prime numbers questions?

... 1 factors ( 1 , p, p^2, ..., p^n...90) = 5, F( 100 ) = 5, F(120.... 4) From #2, p^4 has...t think of any way to express 11 as the sum of three distinct primes .) I hope this...

1 Answers · Science & Mathematics · 21/08/2012

6. ### Math problem that makes NO SENSE to me. Can anyone help? 1 ?

...have students make a table listing the numbers from 1 to 100 in Column 1 . In Column... Column 3, have them find the sum of the factors (without including the...

5 Answers · Science & Mathematics · 24/12/2012

7. ### Homework help?

...primesum to itself to keep the previous sum (s). So, primesum... each time a prime number ...primecount = primecount + 1 (or primecount++). ... sum of all the prime numbers between 1 - 100 and the number...

1 Answers · Education & Reference · 20/05/2007

8. ### Function that returns the sum of all the prime numbers between 1 and N in c++?

... your code from above, fixed the... 17 as a sum with 10 as the input...as expected. To test for edge cases...;< prime (i) <...21 : 77 22 : 77 23 : 100 24 : 100 25 : 100 26...

2 Answers · Computers & Internet · 05/11/2014

9. ### Sum of two square numbers ?

...two sets of numbers containing numbers from 1 to 9 ( 1 ,2,3,4....9) then you can sum their squares up to get the form of a...90 3^2 + 9^2 33 97 4^2 + 9^2 34 98 7^2 + 7^2 35 100 6^2 + 8^2

2 Answers · Science & Mathematics · 21/02/2011

10. ### Queston about prime numbers ....?

...have no reason to expect the next...of the form 6k - 1 or 6k + 1 , then... from the roots...39;s for which 100 ^2n - 100 ^n + 1 ...of being prime are those.... such numbers are way...would be 0.8 * ( sum 1 /k) where k...

6 Answers · Science & Mathematics · 27/11/2011