1,3,5,9,17,33?

• difference of each number in this series from the first number 1..
  3-1=2
  5-1=4
  9-1=8 thus 33-1 = 32. so, 2,4,8,16,32..so next no. will be 64+1=65.(Ans.)
• 11 years agoHelpfull: Yes(32) No(1)
• 2^0 = 1
  2^1+1 = 3
  2^2+1 = 5
  2^3+1 = 9
  2^4+1 = 17
  2^5+1 = 33
  2^6=1 = 65
• 11 years agoHelpfull: Yes(22) No(0)
• 2*2-1=3
  3*2-1=5
  5*2-1=9
  9*2-1=17
  17*2-1=33
  33*2-1=65
• 11 years agoHelpfull: Yes(14) No(4)
• 1+2*1=3
  3+2*1=5
  5+2*2=9
  9+2*4=17
  17+2*8=33
  33+2*16=55
  Ans: 55
• 11 years agoHelpfull: Yes(1) No(17)
• 1+3+5=9
  3+5+9=17
  
  Likewise, 9+17+33=59
• 11 years agoHelpfull: Yes(1) No(10)
• 1*2-1=1
  2*2-1=3
  3*2-1=5
  5*2-1=9
  9*2-1=17
  17*2-1=33
  33*2-1=65
  
• 11 years agoHelpfull: Yes(1) No(0)
• 2 + 3 + 2^0 - 1 = 5
  
  3 + 5 + 2^1 - 1 = 9 2 + 3 + 2^0 - 1 = 5
  
  3 + 5 + 2^1 - 1 = 9
  
  5 + 9 + 2^2 - 1 = 17
  
  9 + 17 + 2^3 - 1 = 33
  
  17 + 33 + 2^4 - 1 = 65 2 + 3 + 2^0 - 1 = 5
  
  3 + 5 + 2^1 - 1 = 9
  
  5 + 9 + 2^2 - 1 = 17
  
  9 + 17 + 2^3 - 1 = 33
  
  17 + 33 + 2^4 - 1 = 65
  
  5 + 9 + 2^2 - 1 = 17
  
  9 + 17 + 2^3 - 1 = 33
  
  17 + 33 + 2^4 - 1 = 65
• 11 years agoHelpfull: Yes(1) No(2)
• 1) 1+3+1+2.5=7.5
  5+1+4+5=15
  4+8+7+11=30
  
  
• 11 years agoHelpfull: Yes(0) No(2)