Question

1,5, 17, 43,?

complete the series​

Answer 1

Step-by-step explanation:

The number themselves have no pattern - they are prime numbers.

But the spacing between them; I notice a pattern.

5 to 17, 12 noted spaces ( a space is another prime number)

17 to 43, 24 noted spaces ( the number of prime numbers doubled)

43 to 89, 11 noted spaces

89 to x, should be 22 noted spaces and that number (22nd ) is 197

My answer is 197.

Answer 2

complete the series

1,5, 17, 43, 89 , 161