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Consider the number 4808
Notice: 4^2+8^2=80
i.e. the sum of the squares of this number's first and last digits equals the number obtained when the first and last digits are erased.

How many numbers with such feature exist below 10000?

Clearly, no leading zeroes.

(Solution Posted, 6 Comments) Submitted on 2017-07-17 by Ady TZIDON   
Page 1 of 96   next >>    
Difficulty: 1 of 5Fermat numbers | Rating: 4.00
Posted on 2017-07-13 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Larger area / larger perimeter |
Posted on 2017-07-03 by Jer (No Solution Yet, 3 Comments)
Difficulty: 3 of 53,7,8 as a start |
Posted on 2017-07-02 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 3 of 538s and Bunches of 1s | Rating: 4.50
Posted on 2017-06-30 by Brian Smith (Solution Posted, 7 Comments)
Difficulty: 3 of 5Square Egyptians |
Posted on 2017-06-28 by Jer (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Giveaway ratios |
Posted on 2017-06-26 by Jer (No Solution Yet, 3 Comments)
Difficulty: 3 of 52017 to start with |
Posted on 2017-06-23 by Ady TZIDON (No Solution Yet, 7 Comments)
Difficulty: 3 of 5Letters to digits to letters |
Posted on 2017-06-22 by Ady TZIDON (Solution Posted, 1 Comments)
Difficulty: 3 of 5Odd Egyptians |
Posted on 2017-06-21 by Jer (No Solution Yet, 2 Comments)
Difficulty: 3 of 5a cube = s.o.d . | Rating: 3.00
Posted on 2017-06-15 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Red vs Black Cuts |
Posted on 2017-06-05 by Brian Smith (Solution Posted, 8 Comments)
Difficulty: 3 of 5Ulam numbers | Rating: 3.00
Posted on 2017-06-03 by Ady TZIDON (Solution Posted, 5 Comments)
Difficulty: 1 of 5Erase one |
Posted on 2017-05-28 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Higher Powers of Eleven |
Posted on 2017-05-24 by Brian Smith (Solution Posted, 4 Comments)
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