Sierpinski number
(number theory) An odd natural number k such that k⨯2ⁿ+1 is composite for all natural numbers n.
Having a single cilium.
Someone who nibbles. / A tool for cutting sheet metal. / A fish of the sea chub subfamily Girellinae. / (computing, historical) A kind of program for copying protected floppy disks.
(US) Abbreviation of Ohio.
数か月にわたる計算の末、数学者たちは78557が任意の自然数nに対してk×2^n+1が常に合成数になるような奇数の自然数k、つまりシェルピンスキー数であることを確認した。
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