Multimagic square 36, 100, ... Value for Trimagic squares 1, 50, 675, 4624, ... Similarly the tetramagic sequence 4-Power 0, 1, 16, 81, 256, 625, 1296, ... Sum of 4-Power 0, 1, 17, 98, 354, 979, 2275, ... Sums for Tetramagic squares 0, 1, 177, ... The first known bimagic square has order 8 and magic constant 260 and a bimagic constant of 11180. It has been conjectured by Bensen and Jacoby that no nontrivial bimagic squares of order less than 8 exist. This was shown for magic squares containing the elements 1 to "n" by Boyer and Trump. However, J. R.
Virginia State Route 256 Landmark that was originally known as Weyer's Cave and is the oldest show cave in the United States. SR 256 has a grade crossing of Norfolk Southern Railway's Roanoke District before reaching its eastern terminus at US 340 (East Side Highway). Virginia State Route 256 State Route 256 (SR 256) is a primary state highway in the U.S. state of Virginia. Known for most of its length as Weyers Cave Road, the state highway runs from U.S. Route 11 (US 11) near Weyers Cave east to US 340 in Grottoes. SR 256 connects Interstate 81 (I-81) with Weyers Cave in