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+ NASA used the space shuttle to place the Hubble Space Telescope (HST) in orbit around Earth at an altitude of 613 kilometers. [Luhn]

+ 6+1+3 = 10, corresponding to the Ten Commandments. 613 is the 13th prime number whose digits add up to 10. Note the 13 Jewish principles of belief. [Doneel]

+ There are exactly 613 precepts (or laws) within the five books of Moses. [Aaron]

+ Even though only 6 of the 13 volumes of his Arithmetica have survived, Diophantus was regarged as the "Father of Algebra." [Motz]

+ The 18th centered square number. Note that 18 = 6*1*3. [Post]

+ NGC 613 is a barred spiral galaxy in the southern constellation Sculptor. The sum of digits of 613 approximates its visual magnitude.

+ 613 is a mathematical enigma in the bewildering story Number of the End by Jason Earls. "Bring the first digit back to get 136, it's triangular. Now bring the first digit of that back to get 361, it's a square."

+ 6132 is the largest known square that divides a number of the form n!+1, which happens when n=229, another prime. [Noe]

(There are 3 curios for this number that have not yet been approved by an editor.)

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