Navigation

520        

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

 

[Tech.]   The lowest frequency (520 kHz) for an AM radio station, available for most commercial radios.

 

[World]  The ISO-3166 country code for Nauru.

 

521

[Library]  ISBN-0-521 is the International Standard Book Number for books published by Cambridge University Press.

 

[Math.]  A prime number. A Mersenne exponent: 2521–1 is the 13th Mersenne prime number.

 

[Math.]  The 13th Lucas number.

 

522…

 

523

[Math.]   A prime number.

5232 = 273,529 = (–2–7+3+529)2.

 

[Sport]  One of soccer’s possible lineup tactics formations: 5-2-3 (5 defenders, 2 midfielders and 3 forwards). A slightly modified defenders line makes: 1-4-2-3 (1 sweeper), or 4-1-2-3 (1 stopper). A slightly modified forwards line makes: 5-2-2-1 (1 striker).

 

524

[Math.]  6×7×9×524×831 = 164,597,832, using each of 9 digits 1-9 once on both sides of the equality.

 

[World]  The ISO-3166 country code for Nepal.

 

525

[Tech.]  BMW (Bayerische Motoren Werke) cars’ numbered models currently: 325 (328, 323), 330, 525, 530, 650, 750 and 760.

 

526

[Library]  First 3 digits in Dewey Decimal Classification System call numbers for library books in Mathematical Geography.

 

527…

 

528

[Library]  ISBN-0-528 is the International Standard Book Number for books published by Rand McNally.

 

[Math.]  A triangular number (sum of all integers from 1 to 32): 528 = 1+2+…+31+32.

 

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

 

[World]  The ISO-3166 country code for Netherlands.

 

528 & 529

[Math.]  A square number 7272 = 528,529, formed by concatenation of 2 consecutive numbers.

 

529

[Library]  First 3 digits in Dewey Decimal Classification System call numbers for library books in (Astronomical) Chronology.

 

[Math.]  A square number: 529 = 232.

 

[Money]  The “529 college savings plans”.

 

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

 

520-529

[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 520-529 are for books in Astronomy.