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(Source: iraffiruse, via 990000)

Kaprekar number

imathematicus:

A Kaprekar number is a number k such that if you square k, and then add the n rightmost digits to the n or n-1 leftmost digits, you yield k.

Let k = 9.
92 = 81. 1+8 = 9.

Let k = 45.
452 = 2025. Since k had two digits, 4 and 5 respectively, n = 2, so you would add the n rightmost digits to the remaining leftmost digits. 20 + 25 = 45.

Let k = 703.
732 = 494209. n = 3. 494 + 209 = 703.

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brooklyntheory:

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