4,25,49,121

• 13^2= 169 because follow sequence of square of the prime numbers
• 8 years agoHelpfull: Yes(6) No(6)
• But to ensure series as squares of prime numbers 2nd prime number '3' is missing....i.e., 3^2 isn't present in the series..
  
• 8 years agoHelpfull: Yes(4) No(2)
• 2^2, 5^2, 7^2, 11^2, 13^2, 17^2...........prime number
• 8 years agoHelpfull: Yes(3) No(5)
• 2*2=4
  5*5=25
  7*7=49
  11*11=121
  13*13=169
  17*17=289 is answer
• 8 years agoHelpfull: Yes(3) No(7)
• 2^2=4
  By leaving one odd (3)
  5^5=25
  7^7=49
  By leaving one odd(9)
  11^11=121
  so according to series the next number should be 13. so
  13^13=169 is the ans
  
• 8 years agoHelpfull: Yes(3) No(2)
• is the question is right or 9 is left in the series..
  presence of 9 only makes it a square of prime numbers!!
  
• 8 years agoHelpfull: Yes(1) No(0)
• these are squares of prime no. so next no wiil be 13^2=169
  
• 8 years agoHelpfull: Yes(0) No(0)
• 2*2,5*5,7*7,11*11,13*13=169
  Prime numbers
• 8 years agoHelpfull: Yes(0) No(0)
• square of prime numbers. 13^2=169
  
• 8 years agoHelpfull: Yes(0) No(0)
• all are squares of prime numbers
  so next 13 square is 169
• 8 years agoHelpfull: Yes(0) No(1)
• it is square of prime no series so 2^2,5^2,7^2,11^2,13^2=169
• 7 years agoHelpfull: Yes(0) No(0)