[GPSCC-chat] Numbers Trivia

[Spencer Graves]

<in line>


On 3/31/2011 7:50 PM, Jim Stauffer wrote:
> This year we're going to experience four unusual dates. 1/1/11, 
> 1/11/11, 11/1/11, 11/11/11 and that's not all...
> Take the last two digits of the year in which you were born -now add 
> the age you will be this year, and the result will be 111 for 
> everyone...!!
> This year October will have 5 Sundays, 5 Mondays and 5 Saturdays.


111 is NOT a prime number (i.e., is not divisible by any integers other 
than 1 and itself).  This is easily seen, because the sum of the digits 
1+1+1 = 3.  This means it is divisible by 3.  Indeed, 111 = 3*37.  This 
is less interesting than Jim's observations, but answers a question that 
Jim's observations brought to my mind.


       Spencer


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