1.Realizar un programa que reciba como dato de entrada un entero N y calcule e imprima el resultado de la siguiente serie: 11 + 22 + 33 + 44 + …+NN

def sum_diag(n):
  sum = 0
  for i in range(1, n+1):
    sum += i * i
  return sum
    
sum_diag(3)

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