9239
This number is a prime.
Just showing those entries submitted by 'Keith': (Click here to show all)
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]
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