Number 43

A page of the Numeropedia - the Special Encyclopedia of Numbers

[40-49]:  40 - 41 - 42 - 43 - 4445 -  46 -  47 - 48 -  49

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[Biology]  The number of muscles needed to frown. (14 needed to smile).

[Chemistry]  The atomic number of Technetium (Tc).

[Chemistry]  Elements with atomic number 43 (Technetium, Tc), 61 (Promethium, Pm) and from 84 (Polonium, Po) up are radioactive.

[Chemistry]  Elements with atomic number 43 (Technetium, Tc), 61 (Promethium, Pm) and from 93 (Neptunium, Np) up are artificial (not or no longer accruing on Earth).

[EECS]  43(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%).   43pF (picofarads) is one of standard numerical values for capacitors.

[History]  Idaho became the 43rd state of the U.S. on 3 July 1890.

[History]  The 43rd U.S. President: George W. Bush (Republican, Texas, 2001-2009).

[History]  U.S. President John Fitzgerald Kennedy (1961-1963, born on 29 May 1917) was inaugurated in January 1961 and became the youngest elected U.S. President, at the age of 43 years 236 days.

When U.S. President William McKinley was assassinated on 14 September 1901, Vice-President Theodore Roosevelt (1901-1909, born on 27 October 1858) became the youngest U.S. President at the age of 42 years 322 days.

[Math.]  A prime number.

[Math.]  One of only four 2-digit prime numbers whose digits are consecutive: 23, 43, 67 and 89.

[Math.]  43 = 42+33.

[Math.]  434 = 3,418,801 and –03–41+88–01 = 43.

437 = 271,818,611,107 = (2+7+1+8+1+8+6+1+1+1+0+7)7.

[Math.]  A prime number.

Repeatedly inserting number 48 into the middle of number 43 gives a sequences of prime number: 43, 4483, 444,883, 44,448,883 and 4,444,488,883.

[Math.]  34´86 = 2,924 = 43´68.

[Math.]  44333 is divisible by 43: 44333 = 43×1031.

22333 is divisible by 23: 22333 = 23×971.

555533333 is divisible by 53: 555533333 = 53×10481761.

[Math.]  The imaginary quadratic fields Q((–43)1/2) is one of only 9 UFDs (unique factorization domains) of form Q((–d)1/2), d = 1, 2, 3, 7, 11, 19, 43, 67 and 163.

[Movie]  Name of TV show/series or movie: “Tehran 43”. Also “Tehran 1943”.

[Phone]  International telephone dialing code for Austria.

[Sport]  The “4-3” scheme is a popular defensive football scheme proposed against the running game of the offensive side which has 4 linemen and 3 defensive linebackers. Other popular schemes are: 3-4, “nickel” and “dime”.

[Tech.]  The “number system” code of an EAN-13 barcode for German’s products: 40, 41, 42, 43 and 44.

40 & 43

[History]  The 40th U.S. President: Ronald Wilson Reagan (Republican, Illinois, 1981-1989).

His Vice President, George Herbert Walker Bush (Massachusetts), was the 43rd U.S. Vice President.

43 & 46

[History]  The 43rd U.S. President: George Walker Bush (Republican, Texas, 2001-2009).

His Vice President, Richard Bruce Cheney (Wyoming), was the 46th U.S. Vice President.