numerus naturalis From Wikipedia, the free encyclopedia
Viginti unus, seu unus et viginti (numeris Arabicis 21, Romanis XXI, Graecis ΚΑʹ) est numerus naturalis et impar inter 20 et 22. Forma binaria est 10101. 21 est numerus triangularis, Fibonaccianus, et Motzkinianus.
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21 in factores primos 3×7 resolvitur. Etiam summa est trium quadratorum: 12 + 22 + 42.
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Haec stipula ad mathematicam spectat. Amplifica, si potes! |
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