Numbers 71,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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1  - 10 - 100  - 1000 - 10,000 - 100,000 - 1M - 10M - 100M1B10B - 100B - 1T - 10T - 100T - 1Q ...

71,145

[Math.]  A pair of all-odd amicable numbers (67095, 71145).

 

71,117

[Math.]  

8×8+13 = 77      

88×8+13 = 717

888×8+13 = 7117

8888×8+13 = 71117

88,888×8+13 = 711,117

888,888×8+13 = 7,111,117

8,888,888×8+13 = 71,111,117

88,888,888×8+13 = 711,111,117

888,888,888×8+13 = 7,111,111,117

8,888,888,888×8+13 = 71,111,111,117

 

71,359

[Math.]  A prime number of all 5 different odd digits.

 

71,433

[Math.]  714332 = 5,102,673,489, a square number using each of 10 digits 0-9 once. (The 51st of 87 such numbers).       

 

71,456

[Math.]  The ratio 71456/8932 = 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.

 

71,463

[Math.]  Two consecutive sums of consecutive numbers:

1681+1682+…+1722 = 1723+1724+…+1763 = 71,463

 

71,536

[Math.]  The ratio 71536/8942 = 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.

 

71,593

[Math.]  A prime number of all 5 different odd digits.

 

715nn

[Zip]  No such U.S. Postal Zip Codes.

 

71,624

[Math.]  The ratio 71624/8953 = 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.

 

71,632

[Math.]  The ratio 71632/8954 = 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.

 

71,933

[Math.]  A right-truncatable prime number: 71933, 7193, 719, 71 and 7 are prime numbers.

 

71,993

[Math.]  Circular prime numbers: all 5 numbers 93719, 37199, 71993, 19937 and 99371 are prime.

 

 71nnn

[Zip]  U.S. Postal Zip Codes of Arkansas: 716nn-719nn and 72nnn.

U.S. Postal Zip Codes of Louisiana: 70nnn and 710nn-714nn.