Salisbury Cathedral of a bell tower which stood about northwest of the main building. Salisbury is one of only three English cathedrals to lack a ring of bells, the others being Norwich Cathedral and Ely Cathedral. However, its medieval clock does strike the time with bells every 15 minutes. In total, 70,000 tons of stone, 3,000 tons of timber and 450 tons of lead were used in the construction of the cathedral. On 25 October 2018, there was an attempted theft of the "Magna Carta" from the cathedral; the alarms were triggered and a 45-year-old man was later detained on suspicion of
Octagonal number pronic number. Octagonal numbers consistently alternate parity. Octagonal numbers are occasionally referred to as "star numbers," though that term is more commonly used to refer to centered dodecagonal numbers. Solving the formula for the "n"-th octagonal number, formula_2 for "n" gives An arbitrary number "x" can be checked for octagonality by putting it in this equation. If "n" is an integer, then "x" is the "n"-th octagonal number. If "n" is not an integer, then "x" is not octagonal. Octagonal number An octagonal number is a figurate number that represents an octagon. The octagonal number for "n" is given by