{"product_id":"9781516949489","title":"Prime Magic Square Puzzles: Based on 5 by 5 magic squares with all prime number entries","description":"The puzzles in this book are based on 5 by 5 pandiagonal magic squares. A pandiagonal magic square has 20 sums to the same number. Each row, each column, each of 5 downward diagonals, and each of 5 upward diagonals sum to the same number, called the magic sum. The four following charts show the 5 rows, the 5 columns, the 5 downward diagonals, and the 5 upward diagonals. The rows, columns, and diagonals will be illustrated using the following magic square. Incidentally, all entries in this magic square are prime integers. 5 103 16067 19 1493 17 1489 17 101 16063 113 16061 13 1487 13 1483 11 109 16073 11 16069 23 1481 7 107 The 5 rows:","brand":"CreateSpace Publishing","offers":[{"title":"Default Title","offer_id":48531764674801,"sku":"9781516949489","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/5433\/7265\/files\/9781516949489_p0.jpg?v=1786309572","url":"https:\/\/shop.barnesandnoble.com\/products\/9781516949489","provider":"Barnes \u0026 Noble","version":"1.0","type":"link"}