Question

5 9 13 ? 57 157 how to solve this question

Answer 1

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Answer 2

Answer:

4n + 1

Step-by-step explanation:

5, 9, 13 falls into the pattern of Hilbert number

Hilbert number has the series ( 4n + 1)

n = 1 ⇒ 4(1) + 1 = 5

n = 2 ⇒ 4(2) + 1 = 9

n = 3  ⇒ 4(3) + 1 = 13

n = 4  ⇒ 4(4) + 1 = 17

....

n = 14  ⇒ 4(14) + 1 = 57

...

n = 39  ⇒ 4(39) + 1 = 157

Answer: 4n + 1