4,000

[Science]  The average temperature (oC, Celsius) of sunspots of the Sun. (To be Verified)

 

[Game]  In the popular TV game show “Who Wants to be a Millionaire?”, a contestant has to answer correctly 15 questions to step up the fixed prizes in U.S.$: 100, 200, 300, 500, 1000, to 2000, 4000, 8000, 16,000, 32,000, to 64,000, 125,000, 250,000, 500,000 and the maximum amount is at least $1,000,000, with 3 lifelines: polling the audience, calling a friend and narrowing to “50:50” answers. The guaranteed middle prizes can be $1000 or $32,000.

 

4004 & 4040

[Tech.]  An Intel CPU family:  8086 (8008, 8080, 8085, 8086, 8087, 8088), which followed 4004 & 4040 and 80186 (80186/80C187, 80188, 80286/80287, 80386/80387, 80486/80487). The x87 is math co-processor.

 

4005

[Math.]  A triangular number (sum of all integers from 1 to 89): 4005 = 1+2+…+88+89.

 

4,008   

[Math.]  40082 = 16,064,064.

 

4,046  

[Measure] The number of square meters (m2) in an acre.

U.S. customary units for area measures: 1 acre = 160 square rods = 4,840 square yards = 43,560 square feet = 6,272,640 square inches = 4046.8564224 m2 & 1 square mile (1 section) = 640 acres = 2,589,988.11 m2 = 2.59 km2 = 259 hectares & 1 hectare = 2.471 acres = 10,000 m2 & 1 township = 36 square miles.

 

4059 & 4060

[Math.]  The 5th square number that is the sum of squares of 2 consecutive numbers: 32,959,081 = 57412 = 40592+40502. Each root number in the series is 6 times the previous root number minus the earlier root number: 1, 52, 292, 1692, 9852Or in other words:

 (4059, 4060, 5741) is the 5th Pythagorean triple (lengths of 3 sides of a right triangle), where 2 sides are consecutive integers.

 

4080

[Tech.]  The approximate temperature (oF) of an acetylene flame. (To be Verified).

 

4,093   

[Math.]  The two equalities 65821/9403 = 7 = 28651/4093 use all 10 digits 0-9 once in each equality.

 

4,095  

[Math.]  A triangular number (sum of all integers from 1 to 90): 4095 = 1+2+…+89+90.

 

4,096

[Math.]  

642 = 4096 = 4095+1

66342 = 44009956 = 44009955+1

666,3342 = 444,000,999,556 = 444,000,999,555+1


4099

[Math.]  A prime number and 40992 = 16,801,801.

 

04nnn

[Zip]  U.S. Postal Zip Codes of Maine: 039nn and 04nnn.