Information: Armstrong number is the sum of cubes of all its digits taken separately.
Example:371, here cube of 3=27, cube of 7 is 343 and cube of 1 is 1.
So 27+343+1=>371.
Other 3 digit Armstrong numbers are:
153,370,371,407.
No two digit Armstrong numbers are available.
And 1 digit Armstrong numbers are 0 andd 1(obviously).
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