FIND NEXT NUMBER IN THE SERIES:
7,21,43,111,157..........
A) 273
B) 179
C) 203
D) 225

• A) 273
  
  A prime number series where each term = n² - (n-1)
  3² - 2 = 7
  5² - 4 = 21
  7² - 6 = 43
  11² -10 =111
  13² -12 =157
  17² -16 = 273
• 7 years agoHelpfull: Yes(0) No(1)