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Armstrong numbers are the sum of their own digits to the power of the number of digits.

EXAMPLES:

370 = 33 + 73 + 03 = 27 + 343 + 0 = 370

9474 = 94 + 44 + 74 + 44 = 6561 + 256 + 2401 + 256 = 9,474

The largest know Armstrong number (in base 10) is 39 digits long:

115,132,219,018,763,992,565,095,597,973,971,522,401

( I have no idea how to say that number.)

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