 Quadratic Residue Patterns Modulo a Prime by Keith Conrad

Online text: kconrad.math.uconn.edu/blurbs/ugradnumthy/QuadraticResiduePatterns.pdf

By Keith Conrad. These standalone notes are hosted on the author's University of Connecticut website. No document date is established.

Cited passages: printed p. 1, title/byline and §1 opening paragraph: nonzero convention and equal counts of squares and nonsquares; printed p. 2, §2 opening notation for the Legendre symbol.