1,3,11,31,71,__

• 1,3,11,31,71 these are prime numbers
  between 1&3 -'1' prime number i.e.,2
  between 3&11-'2' prime numbers i.e.,5,7
  between 11&31-'4' prime numbers i.e.,13,17,19,23
  between 31&71-'8' prime numbers i.e.,37,41,43,47,53,59,61,67
  so, 71 after number is -"157" because
  between 71&157-'16' prime numbers i.e.,73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151
• 5 years agoHelpfull: Yes(0) No(1)