301 (number, HTTP status code, year, and other uses) 301 Overview of 301 as an integer and symbol: its mathematical properties, the HTTP 301 Moved Permanently status, calendar years, telephony area code, and other common meanings.
312 312 — an integer with specific mathematical features; also denotes the year AD 312 and a prominent Chicago telephone area code with cultural uses.
314 (number and year) 314 314 is an integer with simple factorization and cultural ties to π; it also denotes years in ancient and late antiquity with separate historical significance.
323 — the number and the years 323 BC and AD 323 323 Overview of 323 as an integer and as the calendar years 323 BC and AD 323: mathematical properties, the death of Alexander the Great and the Hellenistic aftermath, and the Roman im…
36 (number) — mathematical properties, history, and uses 36 (number) An overview of the integer 36: its arithmetic properties, factorization, status as a square and triangular number, cultural uses (three dozen), and occurrences in geometry and trad…
37 (number) Thirty-seven is a natural odd prime (the 12th prime), atomic number of rubidium, and appears in several simple arithmetic patterns and recreational-mathematical properties.
395 (number) 395 395 is a natural number, an odd semiprime (5 × 79) with several standard numeral representations and historical significance as the year AD 395.
397 (number and year) 397 Overview of 397 as an integer and as a calendar year: mathematical properties, notation, and historical context in the late Roman Empire, including notable figures and legacy.
Three-dimensional (3D): concept, measurement, perception, and applications 3D Overview of three-dimensional space and objects: definitions, measurement, geometric terms, human perception, and practical applications in computing, industry, medicine, art and v…
Four (number) 4 (number) An overview of the number four: mathematical properties, notations, history, cultural significance, and common uses in geometry, time, and symbolism.
Forty (number) 40 (number) Overview of the number 40: its mathematics, notation, etymology, cultural and scientific roles, and notable curiosities.
408 (AD) — leap year, Roman crisis, and the number 408 408 was a leap year in the late Roman Empire notable for the execution of Stilicho and renewed Visigothic incursions; as an integer 408 = 2^3·3·17, an abundant even number with tot…
42 (number) Overview of the integer 42: mathematical properties, factorization, cultural references, scientific occurrences and notable distinctions in mathematics and popular culture.
47 (number) The integer 47: an odd prime between 46 and 48. Mathematical properties, representations, historical notations, occurrences in science and culture, and notable distinctions.
48 (number) An overview of the integer 48: its mathematical properties, divisors and factorization, cultural and scientific references, and common uses and examples.
480: number, properties and notable uses 480 Overview of the integer 480: mathematical properties, common representations, and its occurrences in technology, electricity and history (480 BC/AD).
Four Dimensions (4D): Geometry, History, and Physical Meaning 4D An accessible overview of the concept of four dimensions: geometric ideas, historical development, physical interpretation as spacetime, visualization methods, and important distin…
Five (number) 5 (number) An encyclopedic overview of the number five: its mathematical properties, notation, geometry, history, and cultural significance across science, language, and the arts.
50 (number): properties, history and uses 50 (number) A concise encyclopedia entry on the integer 50: mathematical properties, divisors and factorizations, historical and cultural roles, common uses, and notable appearances such as th…
500 (number) 500 is the natural number after 499 and before 501. An even composite number with factors 2^2·5^3, it appears in mathematics, history (quincentenary), popular culture and computing…
53 (number) Overview and notable facts about the integer 53: mathematical properties, representations, history, uses, and cultural or scientific appearances.
537 (number) 537 Overview and notable facts about the integer 537, including its mathematical properties, base representations, arithmetic functions, and brief historical notes for the year 537 CE.
54 (number) The integer 54: an even composite number with prime factorization 2·3^3. Divisors, arithmetic properties (abundant, semiperfect, Harshad), representations, and cultural and scienti…
540 (number) 540 540 is a composite integer (2^2·3^3·5) known for its role in geometry as the interior-angle sum of a pentagon. It is abundant, a Harshad number, and appears in degree measures and…
56 (number and year AD) 56 An overview of 56 as an integer and as a year: mathematical properties, element with atomic number 56, and historical context for the year 56 AD.
56 (number) — properties, representations, and notable facts 56 (number) Overview of the integer 56: its mathematical properties, divisors and factorization, numeric representations, combinatorial appearances, and occurrences in science and everyday use…
585 (number and years 585 BC / AD 585) 585 Overview of the integer 585 — its arithmetic properties and representations — and brief accounts of the historical years 585 BC and AD 585.
Six (number) 6 (number) An overview of the integer six: its mathematical properties, representations, historical notes, uses and cultural significance, including its status as the first perfect number.
60 (number) An overview of the integer 60: its mathematical properties, factorization and divisors, role in measurement systems and timekeeping, historical use of base‑60, and notable cultural…
622: the number, its properties, and the year AD 622 622 Overview of 622 as an integer (factorization, representations, classifications) and as a historical year, notably the Hijra that marks the start of the Islamic calendar.
66 (number) An overview of the integer 66: arithmetic properties, divisors and factorization, special figurate identities, common representations, and notable uses and examples.
660 (number and year) 660 Overview of the integer 660—its arithmetic properties and classification—and notable associations with the year 660 (AD) and the traditional date 660 BCE.
661 661 is an integer notable as a prime (part of a twin prime pair), expressible as a sum of two squares, appearing as a telephone area code in California and as the year 661 CE in ea…
666 (number) An overview of the integer 666: mathematical properties, factorization and classification, and its prominent cultural and religious associations, including the 'number of the beast…
687 — integer, representations, and historical year 687 Overview of the integer 687: factorization, divisors, arithmetic properties, base representations, related sequences, plus brief note on the year AD 687 and other uses.
Seven (number) 7 (number) Comprehensive overview of the number seven: mathematics, representations (VII, 111), history, cultural roles, common examples and notable distinctions.
70 (number) 70 is an even composite integer. It factors as 2·5·7, is the smallest weird number, equals the binomial coefficient C(8,4), and appears in science, mathematics, and cultural tradit…
700 (number) Overview of the number 700: mathematical properties, factorization, divisors, numeral representations, historical and practical uses.
705 (number, year, and identifier) 705 Overview of the integer 705: its mathematical properties, historical year AD 705, and common modern uses such as telephony area code designations.
710: number, year, and notable references 710 710 is a natural number with prime factors 2, 5, and 71; it appears in calendar history (AD 710), transportation (Interstate 710), and modern culture (7/10 as a cannabis‑oil refere…
72 (number) An overview of the integer 72: arithmetic properties, factorization, divisors, geometric and practical uses, appearances in science and culture, and notable distinctions.
78 (number) 78 is the natural number after 77 and before 79. An even composite integer (2·3·13), it is the 12th triangular number, equals C(13,2), is atomic number 78 (platinum), and appears i…
784 (number) 784 An overview of the integer 784: its factorization, divisors, arithmetic functions, representations in various bases, and notable mathematical properties and relationships.
786 — number, cultural symbol, and uses 786 786 is an integer with mathematical features (2·3·131) and cultural meanings—widely used in South Asian Islam as a numeric shorthand and as a telephone area code; it appears in his…
79 (number) Seventy-nine is an odd prime integer, the 22nd prime, atomic number of gold, and a number with several mathematical and cultural connections, including Messier 79 and the AD 79 eru…
Eight (number) 8 (number) Overview of the natural number eight: mathematical properties, history and etymology, common occurrences, cultural meanings and notable examples.
80 (number) Overview of the integer 80: mathematical properties, divisors and factorization, representations in different bases, linguistic origin, and notable uses such as its atomic number (…
83 (number) Overview and properties of the integer 83, a prime number with mathematical, scientific, and cultural significance including its role as the atomic number of bismuth.
