Mount Vesuvius has erupted many times. The famous eruption in AD 79 was preceded by numerous others in prehistory, including at least three significantly larger ones, the best known being the Avellino eruption around 1800 BC which engulfed several Bronze Age settlements. Since AD 79, the volcano has also erupted repeatedly, in 172, 203, 222, possibly in 303, 379, 472, 512, 536, 685, 787, around 860, around 900, 968, 991, 999, 1006, 1037, 1049, around 1073, 1139, 1150, and there may have been eruptions in 1270, 1347, and 1500. The volcano erupted again in 1631, six times in the 18th century (including 1779 and 1794), eight times in the 19th century (notably in 1872), and in 1906, 1929 and 1944. There have been no eruptions since 1944, and none of the eruptions after AD 79 were as large or destructive as the Pompeian one. Vesuvius entered a new phase in December 1631, when a major eruption buried many villages under lava flows, killing around 3,000 people. Torrents of lahar were also created, adding to the devastation. Activity thereafter became almost continuous, with relatively severe eruptions occurring in 1660, 1682, 1694, 1698, 1707, 1737, 1760, 1767, 1779, 1794, 1822, 1834, 1839, 1850, 1855, 1861, 1868, 1872, 1906, 1926, 1929, and 1944.

Question: Did Mount Vesuvius erupt more times in the 18th or 19th centuries?
Answer: 19th century

Question: How many years passed between the last 2 eruptions at Mount Vesuvius?
Answer: 15

Question: How many severe eruptions occurred from 1707 to 132 years later?
Answer: 9

Question: When was there an eruption exactly 38 years prior to 1944?
Answer: 1906

Question: How many severe eruptions occurred 30 years after 1707 and before 1822?
Answer: 5

Question: When were there severe eruptions four years after 1868 and exactly 54 years after that?
Answer: 1872

Question: How many more eruptions occurred in the 19th century than in the 18th?
Answer: 2

Question: How many years passed before the first severe eruption in 1660 and the last severe eruption?
Answer: 284

Question: When were there severe eruptions between 1920 and 1930?
Answer: 1926, 1929

Question: How many less severe eruptions occurred in the 1600s than in the 1800s?
Answer: 4

Question: How many years apart were the first two eruptions in the 1600s?
Answer: 22

Question: When did a severe eruption happen 23 and 38 years after 1906?
Answer: 1929

Question: How many severe eruptions happened from the first one in the 1700s and the third one of the 1800s?
Answer: 9

Question: When did an eruption happen five years after the 1850 severe eruption but 21 years before that one?
Answer: 1834