SAT Math Practice Question #28639 - SATify | SATify

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SAT Math Practice Question #28639 - SATify | SATify

#28639

number theory

prime numbers

sequences and series

easy

60 sec

How many of the first seven numbers of the sequence $2121, 212121, 21212121, \dots$ are prime numbers?

A.

0

B.

1

C.

2

D.

3

E.

4