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Significats de triangular numbers en anglès

Encara no tenim significats per a "triangular numbers".
Ús de triangular numbers en anglès
1
Now for a little puzzle in triangular numbers.
Amusements in Mathematics
2
Every whole number is either triangular , or the sum of two triangular numbers or the sum of three triangular numbers.
Amusements in Mathematics
3
The analogous series for triangular numbers is 1, 3, 6, 1, 6, 3, 1, 9, 9.
Amusements in Mathematics
4
But indeed unity is triangular ; for every triangular number ( Triangular numbers are those of which equilateral triangles can be formed in this way:
Complete Works of Plutarch — Volume 3: Essays and Miscellanies
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