k=10
sum.int=1
sum.sqint=1
for (i in 2:k) {
   sum.int=sum.int+i
   sum.sqint=sum.sqint+i*i
}
sum.int # Print the sum of integers
k*(k+1)/2 # Formula for comparison
sum.sqint # Print the sum of squared integers
k*(k+1)*(2*k+1)/6 # Formula for comparison