#5050, M’sieur - Somme des premiers entiers

see also

• What Did Ada Lovelace’s Program Actually Do? / HN - n-sum by Pythagoreans, followed by n²-sum by Archimedes, 500 years. later n³-sum by the Indian mathematician and astronomer, Aryabhata, and finally $n^k$-sum by Blaise Pascal in 1665 and a practical method by Bernouilli.