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70 is the fourth discrete sphenic number, as the first of the form . [1] It is the smallest weird number, a natural number that is abundant but not semiperfect, [2] where it is also the second-smallest primitive abundant number, after 20. 70 is in equivalence with the sum between the smallest number that is the sum of two abundant numbers, and the largest that is not (24, 46).
65 is the length of the hypotenuse of 4 different Pythagorean triangles, the lowest number to have more than 2: 65 2 = 16 2 + 63 2 = 33 2 + 56 2 = 39 2 + 52 2 = 25 2 + 60 2. [10] The first two are "primitive", and 65 is the lowest number to be the largest side of more than one such triple. [11] 65 is the number of compositions of 11 into ...
In number theory, a weird number is a natural number that is abundant but not semiperfect. [ 1 ] [ 2 ] In other words, the sum of the proper divisors ( divisors including 1 but not itself) of the number is greater than the number, but no subset of those divisors sums to the number itself.
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
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A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic (that is, after some place, the same sequence of digits is repeated forever); if this sequence consists only of zeros (that is if there is only a finite number of nonzero digits), the decimal is said to be terminating, and is not considered as repeating.
65 4×3 9214845 + 1 10 September 2024 4,396,600 66 9145334×3 9145334 + 1 25 December 2023 4,363,441 67 4×5 6181673 – 1 15 July 2022 4,320,805 68 396101×2 14259638 – 1 3 February 2024 4,292,585 69 6962×31 2863120 – 1 29 February 2020 4,269,952 70 37×2 14166940 + 1 24 June 2022 4,264,676 71 99739×2 14019102 – 1