Posted On 2016-12-27

Answer The given sequence is a sequence of "Happy Primes". Therefore, the answer is 97. A happy prime is a number that is both happy and prime. A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers (or sad numbers).


  • Devansh Rathor