History of Hindu Mathematics: A Source Book v1.c8.s7.t1.26

v1.c8.s7.t1.26

"The cube (of a given number) is equal to the sum of the series whose first term is the given number, the common difference is twice that number, and the number of terms is (equal to) that number.
"Or the square of the given number when added to the product of that number minus one (and) the sum of the series in which the first term is one, the common difference two and the number of terms (is equal to) that number, gives the cube."