numerus naturalis From Wikipedia, the free encyclopedia
Quīndecim (numeris Arabicis 15, Romanis XV, Graecis ΙΕ΄) est numerus naturalis ac triangularis inter quattuordecim et sedecim.
15 in factores primos 3 × 5 resolvitur. Etiam est minimus numerus qui tribus modis summa trium primorum repraesantari potest: 15 = 2 + 2 + 11 = 3 + 5 + 7 = 5 + 5 + 5.
Haec stipula ad mathematicam spectat. Amplifica, si potes! |
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