Johann Faulhaber and sums of powers

Details Johann Faulhaber and sums of powers Johann Faulhaber and sums of powers

1992-07-27

arxiv.org/abs/math/9207222v1

Math. Comp. 61 (1993), no. 203, 277--294

Mathematics

Classical Analysis and ODEs

Scientific paper

Early 17th-century mathematical publications of Johann Faulhaber contain some remarkable theorems, such as the fact that the $r$-fold summation of $1^m,2^m,...,n^m$ is a polynomial in $n(n+r)$ when $m$ is a positive odd number. The present paper explores a computation-based approach by which Faulhaber may well have discovered such results, and solves a 360-year-old riddle that Faulhaber presented to his readers. It also shows that similar results hold when we express the sums in terms of central factorial powers instead of ordinary powers. Faulhaber's coefficients can moreover be generalized to factorial powers of noninteger exponents, obtaining asymptotic series for $1^{\alpha}+2^{\alpha}+...+n^{\alpha}$ in powers of $n^{-1}(n+1)^{-1}$.

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