What will be the next term
3, 7 ,17, 31 ,?

• Set of prime nos.
  between 3 and 7 5 is missing
  between 7 and 17 11 and 13 are missing
  between 17 and 31 19 23 and 29 are missing
  Hence after 31 4 prime numbers to be left are 37 41 43 47
  So the ans is 53.
• 10 years agoHelpfull: Yes(41) No(0)
• Ans:- 53
  
  b/w 3 and 7 one prime no is missing i.e. 5
  similarly,b/w 7 and 17 two prime no is missing i.e.11,13
  b/w 17 and 31 three prime no is missing i.e.19,23,29
  after 31 four prime no. will miss which are 37, 41, 43, 47
  and next no. will be 59
• 10 years agoHelpfull: Yes(20) No(7)
• 2^1+1=3
  2^3-1=7
  2^4+1=17
  2^5-1=31
  2^6+1=65
• 10 years agoHelpfull: Yes(16) No(16)
• 3------7------17------31------x
  
  ----4-----10-------14------y
  
  -------6-------4-------2
  
  So y = 14+2 = 16
  x = 31+16 = 47
  
  Ans : 47
  
• 10 years agoHelpfull: Yes(4) No(8)
• ans:- 59
  
  b/w 3 and 7 one prime no is missing i.e. 5
  similarly,b/w 7 and 17 two prime no is missing i.e.11,13
  b/w 17 and 31 three prime no is missing i.e.19,23,29
  so the no will 4 prime no after 31 i.e.37,41,47,53 then 59
• 10 years agoHelpfull: Yes(3) No(8)
• ans-55
  3,7-4
  7,17-10
  17,31-14
  31,55-24
• 10 years agoHelpfull: Yes(2) No(3)
• 3+7=10;10+7=17
  17+7=24;24+7=31
  17+31=48;48+7=55
  so ans 55
• 10 years agoHelpfull: Yes(2) No(0)
• 55 as 3-7=4
  7-17=10
  so nextwill be 10+4=14
  
  
• 10 years agoHelpfull: Yes(1) No(0)
• 53....each term is written after ignoring prime numbers in the series of 1,2,3,4
• 10 years agoHelpfull: Yes(0) No(0)
• 3,3+4,7+10,17+14,31+20=51
• 10 years agoHelpfull: Yes(0) No(0)
• first find the difference btw 2 numbers like 3 7 17 31 49
  4 10 14 18
  4 4 4
  0 0
• 10 years agoHelpfull: Yes(0) No(3)
• 3-7=4
  7-17=10
  31-17=14
  14+10=24
  31+24=55
  the next number is 55
  
  
  
  
  
  
  
  
  +
• 10 years agoHelpfull: Yes(0) No(1)
• 3,7,17,31
  differences are : 4,10,14
  this follows difference sequence like: 4,10,(10+4), (14+10)
  so 31+28= 59
• 10 years agoHelpfull: Yes(0) No(0)
• B Is the ans.
• 8 years agoHelpfull: Yes(0) No(0)
• 2*1+1=3
  3*2+1=7
  4*4+1=17
  5*6+1=31
  6*8+1=49
  ......
• 7 years agoHelpfull: Yes(0) No(2)