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Uchburchak sonlari — oddiy uchburchak shaklida joylashtirish mumkin boʻlgan sonlar. Shubhasiz, sof arifmetik nuqtai nazardan -uchburchak son dastlabki ta natural sonlar yigʻindisiga tengdir.
uchun uchburchak sonlarining ketma-ketligi quyidagicha boshlanadi:
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