123rd Day of Year: 03.05.19

REFERENCES: H. White, Bordered Magic Squares, http://budshaw.ca/BorderedMagicSquares.html. I.J. TANEJA, Running Expressions: Increasing and Decreasing Orders –  https://inderjtaneja.com/2017/05/24/running-expressions-increasing-and-decreasing-orders/ I.J. TANEJA, Triangular Numbers and Running Expressions with Equalities – https://inderjtaneja.com/2019/01/18/triangular-numbers-and-running-expressions-with-equalities/