Expert: Ahmed Salami - 7/5/2004

Question
Could u please tell me....what is an Armstrong number...
Thank you...

Answer
Hi,
Armstrong numbers (also called narcissistic numbers or plus perfect numbers)are well known in recreational mathematics.
An Armstrong number is an n-digit base b number such that the sum of its (base b) digits raised to the power n is the number itself. Hence 153 because 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153
The most principal information is that the number of Armstrong numbers for a particular base is finite. So, theoretically, you could list all Armstrong numbers up to a particular base.
In base ten, the first few are given by 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748,...
I am sorry i can't explain how to list them now. I hope this little helps.
Regards.