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Since all digits of n are evaluated independently, n is not a regular integer. You can see n as a combination with repetition of digits 0-9 where the order does not matter.
Also the goal is to have the smallest value. #0 > 1# & #! + 0! == 1! + #!, therefore always use 1 instead of 0. 11 > 2 & 1! + !1 == 2!, therefore always use 2 instead of 1 & 1. 222 > 3 & 2! + 2! + 2! == 3!...
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Project Euler #254: Sums of Digit Factorials
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Since all digits of
nare evaluated independently,nis not a regular integer. You can seenas a combination with repetition of digits0-9where the order does not matter.Also the goal is to have the smallest value.
#0 > 1# & #! + 0! == 1! + #!, therefore always use 1 instead of 0.11 > 2 & 1! + !1 == 2!, therefore always use 2 instead of 1 & 1.222 > 3 & 2! + 2! + 2! == 3!...