. 4,7,12,19,28,39..............

• 52...
  The differences are in A.P
• 11 years agoHelpfull: Yes(3) No(3)
• see alternative numbers
  4 12 28
  12-4=8
  28-12=16
  x-28=24
  x=52
  
• 11 years agoHelpfull: Yes(1) No(0)
• ANS:
  53....
  
• 11 years agoHelpfull: Yes(0) No(3)
• 1^1+3=4
  2^2+3=7
  ....
  7^7+3=52
• 11 years agoHelpfull: Yes(0) No(0)