How many numbers in between the 1 to 100 whose factors will be prime ie like 3= 1, 3

• There are 25 prime numbers are there in between 1 and 100
  
  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
  
  Ans : 25
• 10 years agoHelpfull: Yes(15) No(17)
• there are 50 numbers ... in this way .......
  
  all primes - 25
  and other are
  3 multiples - 9 , 15 ,21 ,........99 ....common diff is 6
  5multples - 25,25,...95 ... cd is 10
  7 is 49 ,77
  9 is 81
  totally 50 dudessssssssssssss
• 10 years agoHelpfull: Yes(15) No(3)
• All numbers except squares and cubes of even numbers are the numbers whose factors will be prime.
  Eg. 4,16,36,64. since 4=2*2. Therefore answer is
  all nubers except 4, 16, 36, 64. i.e. 95.
• 10 years agoHelpfull: Yes(7) No(11)
• TO SARASWATI AND DHANANJAY .WHAT ABT 34(2,17)BOTH FACTORS PRIME,39(3,13)BOTH FACTORS PRIME ETC I THINK ITS MORE THAN 25.
  
• 10 years agoHelpfull: Yes(5) No(3)
• the correct answer is 59..(25 + 34)..
  
  25 for number of primes and 34 numbers are from the multiplication of two primes...with 2 u can multiply from 2 to 47..as (47*2=94)..so there are 15 primes from 2 o 47..similarly.......
  
  for 3........from 3 to 31...(10)
  for 5........from 5 to 19..(6)
  for 7.......from 7 to 13..(3)
  from here u will get all numbers above 100..hence,15+10+6+3=34..
  
  so totally 34+25=59
  
• 10 years agoHelpfull: Yes(3) No(1)
• hello u didnt understand questn for eg: even no 6 have factors=1,2,3,6 through continue this determine the all nos between the 1 to 100 which having prime no also a factor
• 10 years agoHelpfull: Yes(1) No(1)
• ans - 25, memorise it.
• 10 years agoHelpfull: Yes(1) No(1)
• 53
  All prime nos. Rest check kr lo ... :)
  
• 10 years agoHelpfull: Yes(1) No(2)
• there are many other numbers also other than prime numbers 2 3 4 5 6 7 9 10 11 13 15 17 19 21 25 29 31 33 34 35 37 39 41 43 45 46 47 49 51 53 55 which are greater than 25 hence 25 is incorrect ans should be greater than it..
  
• 10 years agoHelpfull: Yes(1) No(0)
• i think ans is 98.. al no. b/w 1 &100
• 10 years agoHelpfull: Yes(1) No(1)
• Every composite number can be broken into a set of primes. So 100 such numbers will be there
• 9 years agoHelpfull: Yes(1) No(0)
• 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59,
  61, 67, 71, 73, 79, 83, 89, and 97.
• 10 years agoHelpfull: Yes(0) No(0)
• 
  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
  
  Ans : 25
• 10 years agoHelpfull: Yes(0) No(0)
• @AREEB KARIM, you are right, I understood the problem on seeing CHANDRESH SIKARWAR's solution and there will be more than 25 such numbers.
• 10 years agoHelpfull: Yes(0) No(1)
• Chandresh's solution seems almost right, except for the fact that 1 is not a prime number.
• 10 years agoHelpfull: Yes(0) No(0)