What is the next number of the following sequence
2, 9, 5, 49, 11, 169, 20

• Wrong question... Question might be 2, 9, 5, 49, 11, 169, 17, ?
  Square the alternate prime numbers
  2
  3^2 = 9
  5
  7^2 = 49
  11
  13^2 = 169
  17
  19^2 = 361
  
  Ans : 17, 361
  
  
• 10 years agoHelpfull: Yes(46) No(9)
• It is the sequance of two series
  one is->2,5,11,20
  2
  2+3=5
  5+(3+3)=11
  11+(3+3+3)=20
  another is->9,49,169
  3^2=9
  (3+4)^2=7^2=49
  (7+4+2)^2=13^2=169
  (13+4+2+2)^2=21^2=441
  Ans->441
• 10 years agoHelpfull: Yes(16) No(6)
• yes wrong question
• 10 years agoHelpfull: Yes(6) No(2)
• It's absolutely correct question.
  answer will be 32 , 441 , 47, .........
  series 1 : 2, 5 ,11 , 20 ,...
  next number = 32 (Difference in increase keeps increasing by 3)
  series 2 : 9 or 3^2, 49 or 7^2, 169 or 13^2, ....
  next number = 21^2 or 441 (Difference in increase of bases keeps increasing by 2)
  
• 10 years agoHelpfull: Yes(6) No(4)
• 2,9,5,49,11,169,20,x,y
  (2,5,11,20,y) (9,49,169,x)
  5-2=3
  11-5=6
  20-11=9
  Y-20=12 so,y=32
  3*3=9
  7*7=49
  13*13=169
  21*21=441
  
• 10 years agoHelpfull: Yes(5) No(1)
• Dear Admin,
  Everyone is providing their own solution.Every solution seems correct.Please do interfere and provide the correct solutioin
• 8 years agoHelpfull: Yes(1) No(0)
• [2]+3=[5]
  [5]+6=[11]
  [11]+9=[20]
  Thus we get the series
  2,_,5,_,11,_,20
  now for remaining numbers i.e.
  9,49,169,_
  9=09 where square(0)=0 9 i.e. 09
  49 where square(2)=4 9 i.e. 49
  169 where square(4)=16 9 i.e. 169
  so, next number will be square(6) 9 i.e. 369
  ->369 Ans.
• 10 years agoHelpfull: Yes(0) No(7)
• I think there is 10 in place of 11.
  i think correct series is: 2,9,5,49,10,169,20,?
• 10 years agoHelpfull: Yes(0) No(3)
• 529 =(23)^2
• 10 years agoHelpfull: Yes(0) No(1)
• wrong series i think 2,9,5,49,11,169,17
  because prime numbers
  2
  3^2===>9
  5
  7^2===>49
  11
  13^2==>169
  17
  19^2==>361
• 10 years agoHelpfull: Yes(0) No(1)
• 2, 9, 5, 49, 11, 169, 20,...
  two sequence are there
  one is 2,5=2+3,11=5+6,20=11+9,
  other one is 9=3^2,49=7^2,169=13^2,...
  next term will be (13+6)^2=19^2=361
• 10 years agoHelpfull: Yes(0) No(0)
• 2 3^2=9
  5(difference 3) 7^2=49
  11(difference 6) 13^2=169
  20(difference 9) 21^2=441 s answer
• 10 years agoHelpfull: Yes(0) No(0)
• 2,(2+1)(2+1),5,(5+2)(5+2),11,(11+3)(11+3),20,(20+4)(20+4)
  ans:-576
• 10 years agoHelpfull: Yes(0) No(0)
• 2,(2+1)(2+1),5,(5+2)(5+2),11,(11+2)(11+2),20,(20+3)(20+3)
  ans:-529
• 10 years agoHelpfull: Yes(0) No(0)
• 2 9 5 49 11 169 20 __
  (2 5 11 20) and (9 49 169 __)
  2+1(3)=5
  5+2(3)=11
  11+3(3)=20
  
  2nd series ==square of alt.prime nos.
  3 7 13 ..therefore ans==(19)^2=361
• 10 years agoHelpfull: Yes(0) No(0)
• 2,5,11,20
  2+3=5
  5+6=11
  11+9=20
  other part
  9,49,169,?
  9+40=49
  49+120=169
  169+200=369
  so ans is 369
• 10 years agoHelpfull: Yes(0) No(1)
• absolutely wrong question...........:) :)
• 10 years agoHelpfull: Yes(0) No(0)
• the answer is 361
  but the value will be 17 not 20
• 10 years agoHelpfull: Yes(0) No(0)
• odd series is increasing by 3 every time like 3,6,9,12
  and the even is square of prime no.s
  so the answer will be 289,32
• 8 years agoHelpfull: Yes(0) No(0)