15,31,63,127,255,?

• 15
  15*2+1=31
  31*2+1=63
  63*2+1=127
  127*2+1=255
  255*2+1=511..
• 10 years agoHelpfull: Yes(16) No(0)
• 15 - 31 - 63 - 127 - 255
  16 32 64 128 256 then 256+255= 511 ans
• 10 years agoHelpfull: Yes(1) No(0)
• 15*2 +1 = 31;
  31*2 +1 = 63;
  63*2 +1 = 127;
  127*2 + 1 = 255;
  255*2 +1 = 511.
• 10 years agoHelpfull: Yes(1) No(0)
• 15 * 2 +1 =31
  31*2+1 = 63
  ...
  ...
  255*2 +1 =511
• 10 years agoHelpfull: Yes(1) No(0)
• 255*2+1=511
• 10 years agoHelpfull: Yes(0) No(0)
• 15*2+1=31
  31*2+1=63
  63*2+1=127
  127*2+1=255
  255*2+1=511
• 10 years agoHelpfull: Yes(0) No(0)
• ans: 511
  
  (255*2 )+1
• 10 years agoHelpfull: Yes(0) No(0)
• 2*15+1=31
  2*31+1=63
  ....
  2*255+1=511
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
• 10 years agoHelpfull: Yes(0) No(0)
• 15*2=30+1=31
  31*2=62+1=63
  63*2=126+1=127
  127*2=254+1=255
  255*2=510+1=511
  so answer is 511
• 7 years agoHelpfull: Yes(0) No(0)
• 15*2=30+1=31
  31*2=62+1=63
  similarly
  255*2+1=511
• 7 years agoHelpfull: Yes(0) No(0)