Numbers 560-569

A page of the Numeropedia - the Special Encyclopedia of Numbers

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560

[EECS]  560(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%).  560pF (picofarads) is one of standard numerical values for capacitors.

[Library]  There are about 560 miles of bookshelves inside the Library of Congress.

[Tech.]  The “number system” code of an EAN-13 barcode for Portugal’s products.

561

[Math.]  A triangular number (sum of all integers from 1 to 33):  561 = 1+2+…+32+33.

[Math.]  The first/smallest Carmichael number: 561 = 3×1117.

An odd composite number satisfying Fermat’s little theorem: for any number a relatively prime to n, (an–1–1) is divisible by n. One converse, an ancient Chinese conjecture: “n is a prime number if and only if n divides the number 2n–2” was wrong, by counterexamples: numbers 341 and 561

562

[World]  The ISO country code for Niger. (ISO-3166)

563

[History]  Buddha was born in India in 563 B.C. and died in 480 B.C.

[Math.]  A prime number.

[Math.]  The 3rd Wilson prime number. The only known Wilson prime numbers (up to 5×108) are: 5, 13 and 563.

564...

565

[Math.]  454+545 = 999 = 434+565

4542 = 206,116 & 206+116 = 322

5452 = 297,025 & 297+025 = 322

and

4342 = 188,356 & 188+356 = 544

5652 = 319,225 & 319+225 = 544.

566

[World]  The ISO country code for Nigeria. (ISO-3166)

567

[Math.]  The number 567 and its square 5672 = 321,489 use each of 9 digits 1-9 once.

568

[Measure]  1 pint = 568.2615 ml (milliliters).

British imperial units for dry and liquid measures: 1 bushel = 4 pecks = 8 gallons = 32 quarts = 64 pints = 256 gills = 1280 fluidounces = 36.368736 liters.

569

[Math.]  A prime number.

[Tech.]  The “number system” code of an EAN-13 barcode for Iceland’s products.

[Zip]  Three digits starting 3 special Zip Codes of Washington, DC: 56901, 56915 and 56920.

560-569

[Library]  Numbers 500-599 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Pure Sciences (Mathematics, Astronomy and Chemistry…). Numbers 560-569 are for books in Paleontology…