Number Sequence 1

Number Theory Level 1

Complete this Sequence: 

                                2, 3, 5, 7, 11, 13, 17, 19, _.


The answer is 23.

Mr Cyan by Mr Cyan , 15, USA

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1 solution

X X
Jan 12, 2019

They are prime numbers.

20 = 2 2 × 5 20=2^2\times5

21 = 3 × 7 21=3\times7

22 = 2 × 11 22=2\times11

Hence 23 23 is the first prime after 19 19 .

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This was an easy problem i made.

Mr Cyan - 2 years, 5 months ago

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