The year 2005 looks very different in other bases.

Can you construct 1, 2, 3, 4... using the digits of "two thousand and five"?

In the Base:

Year 2005 becomes:

Our Current Record is:

Link to solutions:

Twelve

11E1

Eleven

1563

Ten

2005

27

Base Ten

Nine

2667

Eight

3725

Seven

5563

52

Base Seven

Six

13141

83

Base Six

Five

31010

The Current Record in the table above indicate that solutions have been achieved for 1, 2, 3... up to and including the number stated. If you have a solution which is different to our published solution then send it to us.

We will publish your name and solution along with your School name. We will even link to your School Web Site if your school has one. If you have a solution that we do not yet have then send it to us. We will publish your name under the "First to Solve" category for that number.

 

Submitting solutions:

  • Tell us your name, age and the name of your school
  • Tell us the Number (in base Ten!) that you have solved and the Number Base you used.
  • Tell us your solution (if symbols are a problem then explain as clearly as you can in words)
  • Tell us your School's Web Site Address if your school has one

We'd like to hear from you... and while you are visiting don't forget to visit our Home Page

 
 

The record for 2004 (in any base) is 12 in Base Ten

The record for 2003 (in any base) is 50 in Base Seven
The record for 2002 (in any base) is 152 in Base Six
The record for 2001 (in any base) is 56 in Base Eight
The record for 2000 (in any base) is 91 in Base Eleven
The record for 1999 (in base 10 only) was 139 (using sub-factorials )
The record for 1999 (in base 10 only) was 136 (without using sub-factorials )
The record for 1998 (in base 10 only) was 131
The Madras College Digits-of-the-Year Record is 152 achieved in 2002.
 
Read the history of this challenge.
 

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