"Sierpinski number" meaning in English

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        "An odd natural number k such that k×2ⁿ+1 is composite for all natural numbers n."
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        "(number theory) An odd natural number k such that k×2ⁿ+1 is composite for all natural numbers n."
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        "An odd natural number k such that k×2ⁿ+1 is composite for all natural numbers n."
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