SUMSQ(value1, value2, ...)
SUMSQ returns the sum of the squares of all the values and cells referenced in the argument list.
This function is Excel compatible.
Let us assume that the cells A1, A2, ..., A5 contain numbers 11, 15, 17, 21, and 43. Then
SUMSQ(A1:A5) equals 2925.
SUM, COUNT.