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5,217

[Calendar]  The number of full weeks in a century: 5217 weeks and 5 or 6 days. The number of full weeks in a 400-year period in a currently-used Gregorian year, after the adoption of the Gregorian calendar, created by Pope Gregory XIII in 1582 to reform the old Julian calendar.

 

5,220

[Math.]  Sum (in degrees) of all internal angles of a 31-side polygon.

 

5,221

[Sport]  One of soccer’s possible lineup tactics formations: 5-2-3 (5 defenders, 2 midfielders and 3 forwards). A slightly modified defenders line makes: 1-4-2-3 (1 sweeper), or 4-1-2-3 (1 stopper). A slightly modified forwards line makes: 5-2-2-1 (1 striker).

 

5,237

[Math.]  A prime number whose 4 digits are the first 4 single-digit prime numbers: 2, 3, 5 and 7.

 

[Math.]  The ratio 41896/5237 = 8, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #8.

 

5,253

[Math.]  A triangular number (sum of all integers from 1 to 102): 5253 = 1+2+…+101+102.

 

5,264 & 5,292

[Math.]  28,005,264 = (28+005264)2 = 52922 and 989,444,005,264 = (989444+005264)2 = 994,7082 and 5292+994708 = 1,000,000.

 

5,271

[Math.]  Two multiples of number 5271, 5271×2 = 10,542 and 5271×7 = 36,897, use each of 10 digits 0-9 once.

 

5,273

[Math.]  A prime number whose 4 digits are the first 4 single-digit prime numbers: 2, 3, 5 and 7.

 

5,274

[Math.]  Each ratio 36918/5274 = 7, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #7.

 

5,279

[Math.]  The 700th prime number.

 

5,280

[Measure]  The number of feet in a mile.

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