Numbers 340-349

A page of the Numeropedia - the Special Encyclopedia of Numbers

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340

[Library]  ISBN-0-340 is the International Standard Book Number for books published by Hodder and Stoughton.

[Phone]  The telephone area code for the U.S. Virgin Islands (within U.S./NANPA).  (NANPA: North American Numbering Plan Administration).

[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).

[Tech.]  Volvo’s numbered series: 140 (142, 144, 145), 164, 240 (242, 244, 245), 260 (262, 264, 265), 340 (343, 345), 360, 440, 460, 480, 740, 760, 780, 850, 940 and 960. Digit 0 is replaced by the number of doors.

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

341

[Math.]  The first composite number to disprove an ancient Chinese conjecture: “n is a prime number if and only if n divides the number 2n–2”. The number 2341–2 is divisible by 341, a composite number 341 = 11´31. The number 341 is called pseudoprime (to base-2). The 2nd pseudoprime is 561, the first Carmichael number.

342...

343

[Math.]  343 = (3+4)3.

[Math.]   (343+656 = 999 = 323+676)

3432 = 117,649 & 117+649 = 766

6562 = 430,336 & 430+336 = 766

and

3232 = 104,329 & 104+329 = 433

6762 = 456,976 & 456+976 = 1432 and 1+432 = 433.

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

344

[Math.]  3442 = 118,336 = (1+1+8+336)2.

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

345

[Library]  ISBN-0-345 is the International Standard Book Number for books published by Ballantine Books.

[Phone]  The telephone area code for the Cayman Islands (within U.S./NANPA).

346

[Astronomy]  The number of full days in an eclipse year: 346.62 days = 346 days 14 hours 52 minutes 54 seconds), the time for the Sun, as seen from the Earth, to complete one revolution with respect to the same lunar node (a point where the Moon’s orbit intersects the ecliptic).

347

[Math.]  A prime number, formed by 3 consecutive Lucas numbers: 3, 4 and 7.

[Math.]

 33×34 = 1122 33×35 = 1155 33×36 = 1188 33×37 = 1221 33×47 = 1551 33×57 = 1881

 333×334 = 111,222 333×335 = 111,555 333×336 = 111,888 333×337 = 112,221 333×347 = 115,551 333×357 = 118,881

… (generalizable pattern) …

348

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

349

[Math.]  A prime number.

340-349

[Library]  Numbers 300-399 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Social Sciences (Economics, Government and Education…). Numbers 340-349 are for books in Law.