9239
This number is a prime.
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Prime 9239 is the unique integer k less than 10000 for
which the value of phi(k)/phi(k+1) is the largest (see
scatterplot below). Phi(9239) = 9238, phi(9240) = 1920, and
9238/1920 = 4.8114583333... . 
[Keith]
Submitted: 2024-01-12 00:19:00; Last Modified: 2024-01-12 01:31:45.
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