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Inhomogeneous quadratic forms and triangular numbers
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 126, Number 1, February 2004
- pp. 191-214
- 10.1353/ajm.2004.0007
- Article
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We prove an explicit formula for the number of representations of an integer as the sum of n triangular numbers for each n in the range 2 ≤ n ≤ 8 as special cases of a more general formula applicable to an inhomogeneous quadratic form over a totally real number field. The formula can be derived by calculating explicitly the Fourier coefficients of a certain Eisenstein series that appears in the Siegel-Weil formula for an inhomogeneous quadratic form.