11712 → 1720+81551 → 1545-6
21746 → 1753+71568 → 1563-5
31753 → 1759+61545 → 1540-5
41720 → 1727+71563 → 1558-5
51727 → 1740+131759 → 1749-10
61558 → 1566+81540 → 1532-8
71740 → 1747+71532 → 1528-4
81749 → 1754+51566 → 1561-5
91561 → 1568+71528 → 1520-8
101754 → 1758+41520 → 1516-4
111568 → 1579+111747 → 1730-17
121730 → 1743+131758 → 1750-8