Sum all components and go to next

I was thinking about my code and I think (after debbuging it) it doesnt work good.
In my task I have this short list of numbers:

numbers = [
        2892921,
        1939929,
        2929202,
        1758690,

I have to add to each other my numbers in this way:

1 + 2 + 3 + … + 2892921 = sum, and my for loop should go next: 1 + 2 + 3 + … + 1939929 = sum2 ect.

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I’ve written this code. Please give me a sign where can I repeair it to work good?

def sum(__self__):
    suma = 0
    for i, val in enumerate(numbers):
        i += 1
        n = val
        for j in range(1, n):
            suma += j
        print(suma)
    return suma

>Solution :

numbers = [
        2892921,
        1939929,
        2929202,
        1758690
]
def sum_n(number):
  return sum(range(1, number+1))
sums = [sum_n(number) for number in numbers]

print(sums)
print(sum(sums))