4, 9, 25, 49, 121, ?

2024

4, 9, 25, 49, 121, ?

Answer: C. 169 — Key idea: each term is the square of a consecutive prime number. 2^2 = 4 3^2 = 9 5^2 = 25 7^2 = 49 11^2 = 121 The next prime after 11 is 13, so the next term…

  1. A.

    196

  2. B.

    225

  3. C.

    169

  4. D.

    None

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Correct answer: C

Key idea: each term is the square of a consecutive prime number.
2^2 = 4
3^2 = 9
5^2 = 25
7^2 = 49
11^2 = 121
The next prime after 11 is 13, so the next term is 13^2 = 169.
Answer: 169

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