BabelNet

bn:02918533n

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In mathematics, a Catalan pseudoprime is an odd composite number n satisfying the congruence n − 1 2 ⋅ C n − 1 2 ≡ 2, {\displaystyle ^{\frac {n-1}{2}}\cdot C_{\frac {n-1}{2}}\equiv 2{\pmod {n}},} where Cm denotes the m-th Catalan number. Wikipedia

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