Numbers 310-319

A page of the Numeropedia - the Special Encyclopedia of Numbers

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310

[Math.]  Six square numbers using the same digits: 1302 = 16900, 1402 = 19600, 3102 = 96100, 1032 = 10609, 2472 = 61009 and 3012 = 90601.

[Tech.]  A family of passenger airplane/jetliner Airbus: A-300 (and shorter variant A-310), A-320, (shorter variants A-318, A-319 and stretched variant A-321), A-330, A-340, A-350 and A-380 (as of 2006).

311

[Math.]  An absolute prime number (or permutable prime number): all 3 numbers 311, 113 and 131 are prime or in fact, absolute prime.

[Math.]  Circular prime numbers: all 3 numbers 311, 113 and 131 are prime.

A right-truncatable prime number: self, 31 and 3 are prime numbers.

[Math.]  Reversible numbers and their squares: 3112 = 96,721 and 12,769 = 1132.

[Phone]  An NANPA/U.S. telephone area code reserves for police non-emergencies and other special functions. This number cannot be used as area code.

[Phone]  A 7-digit number after an NANPA/U.S. 3-digit area code cannot start with 0nm, 1nm or 8 other 3-digit numbers: 211, 311, 411, 511, 611, 711, 811 and 911.  (NANPA: North American Numbering Plan Administration).

312

[Library]  ISBN-0-312 is the International Standard Book Number for books published by St. Martin’s Press (or St. Martin’s Griffin, Tom Doherty Associates, Inc.). Also, ISBN-1-403.

[Math.]  25,986 = 213×122 and backward 312×221 = 68,952.

[Math.]   3122 = = 143+153+163+173+183+193+203+213+223+233+243+253 = 97334.

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

313

[Math.]  A palindromic prime number.

A bi-truncatable prime number: self, 31 and 3 are prime numbers.

314

[Library]  ISBN-0-314 is the International Standard Book Number for books published by West Publishing Company.

314 & 316

[Math.]  Squares of 2 consecutive even numbers using the same digits: 3142 = 98,596 and 3162 = 99,856.

315

[Math.]  3152 = 253+263+273+283+293 = 99,225.

[Math.]  315 = (4+3)×(4+1)×(4+5).

316

[Library]  ISBN-0-316 is the International Standard Book Number for books published by Little, Brown and Company/Back Bay Books. Also, ISBN-0-8212.

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

317

[Math.]  A bi-truncatable prime number: self, 31 and 3 are prime numbers and so are 17 and 7.

[Math.]  The only known 7 prime numbers consisting of the repeated digits 1 are the numbers of 2, 19, 23, 317, 1031, 49,081 and 86,453 digits 1.

318 & 319