Erdős problem / erdos
no open offerProblem 413
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theoretical
Erdős Problem #413: declared status 'open'. Formalized: yes. Let count the number of distinct primes dividing . Are there infinitely many such that, for all , we have ? Can one show that there exists an such that there are infinitely many where for all ? Prize: no. OEIS: A005236. Tags: iterated functions, number theory.
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