5000 (separate page)

5,001

[Math.]  50014 = 625,500,150,020,001.

5,010

[Math.]  50102 = 25,100,100.

5,020

[Math.]  A pair of amicable numbers (5020, 5564).

[Money]  A Maestro debit card number starts with digits 5020 or 6.

5,026

[Gov.]  The number of public airports in the U.S., as of the end of 2003.

5,027

[Math.]  The only equation of this form: 140685+62375+50275 = 141325+2205, where its largest entry is less than 20000 (found by Bob Scher, 1995).

5,029.2

[Measure]  1 rod = 5,029.2 mm (millimeters).

U.S. customary units for linear measures: 1 mile = 8 furlongs = 320 rods = 1,760 yards = 5,280 feet = 63,360 inches.

5,040

[Math.]  Sum (in degrees) of all internal angles of a 30-side polygon.

[Math.]  7 factorial = 7! = 1×2×…×6×7 = 5,040 = 7×8×9×10.

[Tech.]  The number of actual staples in a box of 5000 staples: 24 strips of 210 staples in each trip.

5,041

[Math.]  One of only 3 known square numbers, which are a factorial plus 1:

25 = 52 = 4!+1, 121 = 112 = 5!+1 and 5041 = 712 = 7!+1.

Mathematician Paul Erdös conjectured that these are the only such numbers, called Brown numbers.

5,049

[Math.]  50493 = 128,711,132,649 = (1287+1113+2649)3.

[Zip]  U.S. Postal Zip Code: Hartland Four Corners, Vermont 05049.

5,050

[Math.]  (Sequence of numbers 55 and 50…050…0).

50502 = 25,502,500 and 2550+2500 = 5050.

50504 = 650,377,506,250,000 and 650+3775+0625+0000 = 5050.

[Math.]  (Sequence of numbers 49…950…0 and 50…050…0).

24,502,500 = (2450+2500)2 = 49502 and 25,502,500 = (2550+2500)2 = 50502 and 4950+5050 = 10000.

5,054

[Math.]  5,054 = 555+0+55+4444.

5,072

[Geology]  The highest railway point in the world, at Ticlio Pass, Peru: 4818 meters/15806 feet. (As of 2005, China is building a railway connection between Golmud and Lhasa that will cross a mountain pass at 5072 meters, 16644 feet).

5,081

[Math.]  A sequence of prime numbers of similar pattern: 11171, 10181, 9181, 8171, 7151, 6121 and 5081, whose differences are 990, 1000, 1010, 1020, 1030 and 1040, respectively.

05nnn

[Zip]  U.S. Postal Zip Codes of Vermont: 05nnn.