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happy number




If you iterate the process of summing the squares of the decimal digits of a number and if this process terminates in 1, then the original number is called a happy number. For example 7 right-arrow (72) 49 right-arrow (42 + 92) 97 right-arrow (92 + 72) 130 right-arrow (12 + 32)10 right-arrow 1.


Related entry

   • amicable numbers


Related category

   • TYPES OF NUMBERS