Using “Pascal’s” triangle to sum kth powers of consecutive integers Al-Bahir fi'l Hisab (Shining Treatise on Calculation), al- Samaw'al, Iraq, 1144 Siyuan.

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Using “Pascal’s” triangle to sum kth powers of consecutive integers Al-Bahir fi'l Hisab (Shining Treatise on Calculation), al- Samaw'al, Iraq, 1144 Siyuan Yujian (Jade Mirror of the Four Unknowns), Zhu Shijie, China, 1303 Maasei Hoshev (The Art of the Calculator), Levi ben Gerson, France, 1321 Ganita Kaumudi (Treatise on Calculation), Narayana Pandita, India, 1356

Note that the binomial coefficient j choose k is a polynomial in j of degree k.

All the coefficients are positive integers. Can we find a simple way of generating them? Can we discover what they count?

HP(k,i ) is the House-Painting number It is the number of ways of painting k houses using exactly i colors

HP(k,i ) is the House-Painting number

X 4

X 3

X 2

HP(k,i) is always divisible by i! (number of ways of permuting the colors) HP(k,i) / i! = S(k,i) = Stirling number of the second kind