Quantum redactiones paginae "Viginti unus" differant
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[[cv:21 (хисеп)]] |
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[[da:21 (tal)]] |
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[[en:21 (number)]] |
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[[eo:Dudek unu]] |
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Emendatio ex 19:00, 9 Maii 2009
21 est numerus triangularis, cuius factorizatio est 3 x 7.