Filter by: Content type: ALL Problems Articles Games Stage: All Stage 1&2 Stage 2&3 Stage 3&4 Stage 4&5 Challenge level:
Yatir from Israel describes his method for summing a series of triangle numbers.
Find $S_r = 1^r + 2^r + 3^r + ... + n^r$ where r is any fixed positive integer in terms of $S_1, S_2, ... S_{r-1}$.
The harmonic triangle is built from fractions with unit numerators using a rule very similar to Pascal's triangle.