Naira

• Nov 1st, 2020

2²-1² = 3 (4-1=3)
3²-2² = 5 (9-4=5)
5²-3² = 16 (25-9=16)
16²-5² = 231 (256-25=231)

Rohit

• Aug 24th, 2012

Answer is 42

Explanation:
Add prev 2 numbers (16+5), if the result is a prime number then the answer is the prime number, else it is twice of the result number (16+5=21, 21*2=42).

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