7,5,9,12,18,36,47,72,? find the missing number

• firstly skip first two numbers and after that...
  3^2=9
  again skip two numbers..
  6^2=36
  again skip two numbers we will get the missing number as...
  9^2=81
  
  so answer will be 81
• 11 years agoHelpfull: Yes(12) No(11)