Sweikhuizen

Source: OnbekendUnknown author

Copyright: Public domain

Description

Sapevi che il codice postale di Zweikhuizen è 6174? E se sei appassionato di teoria dei numeri, questo ti suonerà familiare.

È il numero che ottieni sempre quando esegui la routine di Kaprekar. Si tratta di un algoritmo iterativo prendendo il nome dal suo inventore, il matematico indiano D. R. Kaprekar. Ogni iterazione inizia con un numero, ordina le cifre in ordine decrescente e crescente, e calcola la differenza tra i due nuovi numeri.

Come esempio, partendo dal numero 8991 in base 10:

9981 – 1899 = 8082

8820 – 0288 = 8532

8532 – 2358 = 6174

7641 – 1467 = 6174

6174, conosciuto come la costante di Kaprekar, è un punto fisso di questo algoritmo. Qualsiasi numero a quattro cifre (in base 10) con almeno due cifre distinte raggiungerà 6174 entro sette iterazioni.

Source

Source: Wikipedia

Translated by OpenAI

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