1387 (number and year) 1387 A concise reference on 1387: its mathematical properties as an integer (factorization, representations, divisors) and the historical context of the year 1387 in the late 14th centu…
1388 (number and year) 1388 An overview of 1388 as an integer and of the year 1388 AD, covering its mathematical properties, major historical events (including the Merciless Parliament and the Battle of Otter…
1390 (number and year) 1390 1390 as an integer and as the calendar year: mathematical characteristics, the historical and cultural context of the late 14th century, and notable associations and legacies.
1391 — the year and the number: history, mathematics, and significance 1391 Overview of 1391 as a calendar year in the late Middle Ages and as the integer 1391, covering major historical context, the 1391 Iberian anti-Jewish riots, and basic mathematical p…
1394 1394: the integer with its arithmetic properties, the year AD 1394 in late medieval history, and the IEEE 1394 digital interface (FireWire) used for high‑speed data transfer.
1411 (year and number) 1411 1411 is both a natural number and the calendar year AD 1411. As a number it is the semiprime 17×83; as a year it is noted for the First Peace of Thorn and the Battle of Harlaw, amo…
1416 (integer) 1416 1416 is an even composite integer (2^3·3·59). It has 16 divisors, is abundant, and appears in multiple numeral systems (binary 10110001000, hex 0x588). It also denotes the years 14…
1418 — the integer and the year AD 1418 1418 Overview of 1418 as a number (mathematical properties, representations) and as a calendar year (notable historical events and context).
1426 1426 is a natural number and a calendar year in the 15th century. As a number it factors as 2 × 23 × 31 and has specific divisor and totient properties; as a year it belongs to the…
1428 (number and year) 1428 Overview of 1428 as an integer (arithmetic properties, factorization and representations) and as the calendar year MCDXXVIII, with historical context and notable facts.
1430 (year and number) 1430 Overview of 1430 as a calendar year and as an integer: historical context, notable events, mathematical properties (including its identity as the 8th Catalan number), and cultural…
1433 — the number and the year 1433 Overview of 1433 as an integer (properties, representations) and as a historical year in the 15th century, with context, notable events, and distinguishing facts.
1434 — the number and the year 1434 Overview of 1434 as an integer and as the calendar year 1434 CE: numeric properties, divisors and classification, and key historical events in exploration, politics and culture.
1435 — the number and the year 1435 Summary of 1435 as an integer (factors, arithmetic properties, numeral forms) and as a historical year in the late Middle Ages, including its political context and cultural backgro…
1436 — the integer and the year 1436 Overview of 1436 as a number and the calendar year: mathematical properties, historical context (notably Brunelleschi's dome), common uses, and notable distinctions.
1438 — the number and the year 1438 Overview of 1438 as an integer and as a calendar year: mathematical properties, historical context in the 15th century, cultural and political notes, and notable distinctions.
1441 1441 — a natural number and a year in the 15th century. Summary of its mathematical properties (palindromic semiprime, factors, representations) and its historical context in the y…
1448 (number and year) 1448 Overview of 1448 as an integer and as a calendar year in the 15th century, covering its mathematical properties, calendar status, and historical context including Ottoman–European…
1449 1449 is both an integer and a calendar year. Mathematically it equals 3^2·7·23; historically, the year 1449 is best known for the Ming dynasty Tumu Crisis when the Chinese emperor…
1456 (number and year) 1456 Overview of the integer 1456, its basic arithmetic properties, and notable events of the year 1456 CE, including the Siege of Belgrade and seismic activity in Italy.
146 (number) 146 Overview and properties of the integer 146: arithmetic facts, factorization, representations, divisor and totient values, aliquot sequence, and notable number-theoretic characteris…
1460 — the year and the integer 1460 Overview of 1460 as an integer and as the year AD 1460: mathematical properties, calendar facts, and key historical context in late medieval Europe, including events in the Wars of…
1465 1465 is both a year of the 15th century and an integer. Politically notable for noble resistance to royal centralization in France, it also sits as the composite number 1465 = 5 ×…
1472 (number and year) 1472 1472 is the integer 2^6 × 23 and the Julian leap year AD 1472. This entry summarizes its arithmetic properties, numeral forms and historical context in the late Middle Ages and ear…
1488 (white supremacist numeric code) 1488 1488 is a hate symbol combining two neo-Nazi codes: the “14 words” slogan and 88 (H for 'Heil Hitler'). It's used as a shorthand by extremists and is monitored and banned in many c…
Fifteen (number) 15 (number) Fifteen (15) is an odd composite integer between 14 and 16. It equals 3×5, is a triangular and hexagonal number, appears as a binomial coefficient, and has many mathematical, scien…
1528 (number and year) 1528 1528 is an integer with specific arithmetic properties and also denotes a year of the 16th century, situated in the Renaissance, Reformation and Age of Discovery.
1551 (number and year) 1551 1551 is a four-digit integer notable as a palindromic composite (3×11×47) and the calendar year 1551 CE, a mid-16th century date associated with Renaissance culture and early colon…
16-cell (hexadecachoron) 16-cell A regular four-dimensional convex polytope with 16 tetrahedral cells; dual to the tesseract and a member of the six regular convex 4-polytopes.
1600 (leap year in the Gregorian calendar) 1600 Overview of the year 1600 as a Gregorian leap year: a century leap year divisible by 400, starting on Saturday in the Gregorian system, with context on calendar reform and prolepti…
1677 1677 as a natural number and a calendar year: mathematical properties, numeric representations, and the broader historical context of the late 17th century.
1711 (year and number) 1711 1711, an early 18th-century year of dynastic wars and cultural change (Pruth campaign, Quebec expedition, South Sea Company, Handel's Rinaldo, The Spectator, Pope) and the integer…
1728 (year and number) 1728 1728 as both an 18th‑century year and the integer 12^3: historical context, notable births and voyages of the period, and mathematical and measurement significance such as the 1,72…
18 (number): mathematical properties, representations, and cultural roles 18 (number) Overview of the number 18: its arithmetic properties, divisors and multiples, representations, cultural and legal significance, and notable occurrences in science and sport.
19 (number) An overview of the integer 19: mathematical properties, representations, etymology, occurrences in science, and notable facts and examples.
2 (number) The natural number two: its mathematical properties, notation, historical origins, role in computing and culture, and notable distinctions such as being the only even prime.
Twenty (number) — properties, history and uses 20 (number) Overview of the integer 20: its mathematical properties, divisors, numeral systems, geometry, cultural roles and scientific occurrences.
2032 2032 is a leap year beginning on Thursday in the Gregorian calendar. It is the 32nd year of the 21st century and 3rd millennium; notable scheduled events include the Brisbane Olymp…
2040 (year) 2040 The year 2040 is a Gregorian leap year beginning on Sunday. It is the 40th year of the 21st century and the 3rd millennium, marking the opening year of the 2040s decade.
222 (number and year) 222 Overview of 222 as an integer and a calendar year: mathematical properties, divisors and representations, events associated with AD 222, and common cultural and practical uses.
23 (number) 23 is a natural, odd number and the ninth prime. It appears in mathematics, science (atomic number of vanadium; human chromosomes), and culture (sports, folklore, arts).
24 (number): properties, history, and common uses 24 (number) Comprehensive overview of the integer 24: arithmetic properties, divisors, factorial and group appearances, cultural uses (hours, carat gold, music), and notable mathematical facts…
24-hour clock A method of expressing time by numbering hours 00–24 without a.m./p.m.; widely used in transport, computing, military, and many countries for unambiguous timekeeping and data excha…
25 (number) Overview of the integer 25: mathematical properties, notation and representations, historical and cultural uses, examples and notable distinctions.
272 (number) 272 272 is an even composite integer equal to 2^4 × 17. It has ten divisors, totient 128, sum of proper divisors 286 (abundant), and appears as the year 272 AD in Roman history.
Two-dimensional (2D) shapes and concepts 2D Overview of two-dimensional geometry: definitions, properties, history, common examples and practical uses in mathematics, computing, graphics and everyday representation.
Three (3): mathematical properties, history, and cultural significance 3 (number) Concise overview of the number three, its mathematical properties (prime, Mersenne prime, sequences), historical and cultural roles, common uses, geometric and symbolic importance.
30 (number) An overview of the integer 30: its mathematical properties, divisors, representations, history of the name, and common uses and cultural references.
