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A pronic number is a number that is the product of two consecutive integers, that is, a number of the form (+). [1] The study of these numbers dates back to Aristotle.They are also called oblong numbers, heteromecic numbers, [2] or rectangular numbers; [3] however, the term "rectangular number" has also been applied to the composite numbers.
Examples include the seven days of creation and so seven days that make up a week, and the seven lamps on the Temple Menorah. One variation on the use of seven is the use of the number six in numerology, used as a final hallmark in a series leading to a seven (e.g. mankind is created on the sixth day in Genesis, out of the seven days of creation).
A number n that has more divisors than any x < n is a highly composite number (though the first two such numbers are 1 and 2). Composite numbers have also been called "rectangular numbers", but that name can also refer to the pronic numbers, numbers that are the product of two consecutive integers.
with π (x) being the number of prime numbers less than or equal to x. The end points of these two ranges are a square between two pronic numbers, with each of the pronic numbers being twice a pair triangular number. The sum of the pair of triangular numbers is the square.
A graded numerical sequence or numerical proverb, sometimes [where?] called an n/n+1 saying or numerical heightening, is a literary form employed in the Hebrew Bible.It is found especially in Proverbs, Job, and Amos, and is used to list attributes, compare items, and catalogue sins. 38 biblical examples have been identified, [1] as well as in the Book of Sirach.
The Biblia pauperum (Latin for "Paupers' Bible") was a tradition of picture Bibles beginning probably with Ansgar, and a common printed block-book in the later Middle Ages to visualize the typological correspondences between the Old and New Testaments. Unlike a simple "illustrated Bible", where the pictures are subordinated to the text, these ...
A number that has the same number of digits as the number of digits in its prime factorization, including exponents but excluding exponents equal to 1. A046758: Extravagant numbers: 4, 6, 8, 9, 12, 18, 20, 22, 24, 26, 28, 30, 33, 34, 36, 38, ... A number that has fewer digits than the number of digits in its prime factorization (including ...
30 is a square pyramidal number. 30 is an even , composite , pronic number . With 2 , 3 , and 5 as its prime factors , it is a regular number and the first sphenic number , the smallest of the form 2 × 3 × r {\displaystyle 2\times 3\times r} , where r is a prime greater than 3.