...The Digit of the Year Challenge...
...The Digit of the Year Challenge...
The earliest reference we can find to this activity is in an article in the Journal of Recreational Mathematics Vol 8 (2) , 1975 - 76 entitled 'Treat 1975 in an orderly fashion" by Mary Sullivan, Joanne Costello and Margaret Kenney from Boston College Mathematics Institute, Massachusetts. Solutions are given for 1 - 100 using 1 , 9 , 7 and 5 although they had to fall back on some dubious tricks eg .1) 9 meaning .1 divided into 9 and [7/5] meaning the greatest integer less than or equal to 7/5.
In recent years we have obtained all solutions from 1 up to and including...
|
|
|
|
|
20 |
|||
2008 |
- |
not attempted | |
2007 |
- |
not attempted | |
22 |
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
* 32 is the new millenial record |
|
|
|
|
* 152 is our all time record!! |
|
|
|
|
|
|
|
|
|
up to 135 apart from 94 |
|
|
|
|
139 allowing sub-factorial signs |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
150 is our second best ever |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
up to 101 apart from 51 |
