28. 5,9,12,18,26,36,47,72,……? .Here odd terms have difference as multiples of 7 and even terms adds with themselves to form the next number.

• 75 and 144 as the last odd number is 47 and 47+28(next multiple of 7)=75
  and last even number 72 will add up itself to give 144
  thus the missing numbers of series are 75&144
  
• 11 years agoHelpfull: Yes(7) No(2)