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Reference.org
Chebyshev's bias
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<p>In <a href="/facts/Number_theory/zhoa7zrc">number theory</a>, Chebyshev's bias is the phenomenon that most of the time, there are more <a href="/facts/Prime_number/L20FLkgn">primes</a> of the form 4<i>k</i> + 3 than of the form 4<i>k</i> + 1, up to the same limit. This phenomenon was first observed by Russian mathematician <a href="/facts/Pafnuty_Chebyshev/LzRqLqRm">Pafnuty Chebyshev</a> in 1853. </p>