Find the missing number

2,5,10,17,_

• 1^2+1=2
  2^2+1=5
  3^2+1=10
  4^2+1=17
  so,the answer is 5^2+1=26
• 11 years agoHelpfull: Yes(6) No(2)
• 28.
  
  Increasing by consecutive prime numbers.
  
  2 +3 = 5
  5 +5 = 10
  10 +7 = 17
  17 +11= 28
• 12 years agoHelpfull: Yes(3) No(6)
• 28 is the correct answer
• 6 years agoHelpfull: Yes(0) No(0)