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AMC (AIMO validation set) / https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_3 / How many of the first ten numbers of the sequence 121,11211,1112111,… are prime numbers?

Problem

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problem

How many of the first ten numbers of the sequence

121, 11211, 1112111, \ldots

are prime numbers?

Plain-text mathematical notation (without MathML)

How many of the first ten numbers of the sequence 121,11211,1112111,… are prime numbers?

Original LaTeX notation

How many of the first ten numbers of the sequence $121, 11211, 1112111, \ldots$ are prime numbers?

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Source and history

upstream_id / Original problem ID: https://artofproblemsolving.com/wiki/index.php/2022_AMC_12B_Problems/Problem_3
task_id: 7c724347-0e9f-5193-a957-746048080c29
task_key: default--train--https~3a~2f~2fartofproblemsolving~2ecom~2fwiki~2findex~2ephp~2f2022~5fAMC~5f12B~5fProblems~2fProblem~5f3
task_revision_id: 2
config / split: default / train

Official source

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