4,200

[Geology]  The length (feet) of the main span (between its 2 supporting poles/posts) of the Golden Gate Bridge, the suspension bridge connecting San Francisco and Marin County, California, opened for vehicular traffic on 8 May 1937. It was designed by Joseph B. Strauss and cost U.S. $35.5 million.

 

4,224

[Math.]

66×64 = 4224

66×67 = 4422

66×68 = 4488

66×69 = 4554

66×74 = 4884

 

666×661 = 440,226

666×666 = 443,556

666×669 = 445,554

666×672 = 447,552

666×663 = 441,558

666×667 = 444,222

666×670 = 446,220

666×674 = 448,884

666×664 = 442,224

666×668 = 444,888

666×671 = 446,886

666×675 = 449,550

… (generalizable pattern) …

 

4,225

[Math.]  The smallest square number, which is the sum of 2 different square numbers in 2 ways: 4225 = 652 = 632+162 = 562+332.

 

[Math.]  Repeatedly inserting numbers 42 between the digits 4 and 2 in the square number 4225 = 652 yields other squares 442225 = 6652, 44422225 = 66652, 444222225 = 666652, 44442222225 = 6666652

 

4,231

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

 

4,243

[Math.]  4243 = 444+22+444+3333.

 

4,253

[Math.]  A prime number.  A Mersenne exponent: 24253–1 is the 19th Mersenne prime number.

 

4,256

[Math.]  65242 = 42,562,576, starting with the root number backward, 4256.

 

4,260

[Math.]  The number of left-truncatable prime numbers.

The largest one is: 357,686,312,646,216,567,629,137.

 

4,278

[Math.]  A triangular number (sum of all integers from 1 to 92): 4278 = 1+2+…+91+92.