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The converse of this result is the definition of Ramanujan primes:
:The ''n''th Ramanujan prime is the least integer ''R<sub>n</sub>'' for which <math>\pi(x) - \pi(x/2) \ge n,</math> for all ''x'' ≥ ''R<sub>n</sub>''.<ref>{{MathWorld|
The first five Ramanujan primes are thus 2, 11, 17, 29, and 41.
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