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218 Chapter 4 PRIMALITY PROVING<br />

(2) If the product P of all the primes p ≤ T is such that P ≥ m, then<br />

ϕ(m)<br />

m<br />

≥ <br />

p≤T<br />

<br />

1 − 1<br />

<br />

.<br />

p<br />

Use ideas such as this to show the inequality for 200560490131

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