Calculate ( 2000)+1720+1641+1563+1486 +1410 ?



How do I calculate ( 2000)+1720+1641+1563+1486 +1410 = 9820?

( 2000) base number
+1720
+1641
+1563
+1486
+1410
-------------
Total = 9820

1720 = 2000 - 80
1641 = 1720 - 79
1563 = 1641 - 78
1486 = 1563 - 77
1410 = 1486 - 76

How does this polynomial work? It's name? Website reference?

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