Pandigital fun

04202017, 09:42 AM
Post: #1




Pandigital fun
Have a look at this paper.
Pandigital representations of numbers up to 11111 where the digits are in ascending or descending order and only basic operations are used. Code: 41 = 12 − 34 − 5 + 67 − 8 + 9 Pauli 

04202017, 10:48 AM
(This post was last modified: 04202017 10:48 AM by pier4r.)
Post: #2




RE: Pandigital fun
Just saw a video on numberphile about this and I wanted to create a programming challenge (limited to 3 digits numbers, that is already enough for a calculator).
But you spoiled it . Well no, I can do it nevertheless using the paper for checking the solutions. Wikis are great, Contribute :) 

04202017, 12:53 PM
Post: #3




RE: Pandigital fun
(04202017 10:48 AM)pier4r Wrote: Just saw a video on numberphile about this and I wanted to create a programming challenge (limited to 3 digits numbers, that is already enough for a calculator). What about another kind of fun? Evaluate this: Evaluate that: Random order and ascending order. Descending order still missing... 

04202017, 02:30 PM
(This post was last modified: 04202017 02:33 PM by pier4r.)
Post: #4




RE: Pandigital fun
Well Gerson, while computing Pi in that way is fun, to me it is already a challenge to break down numbers.
In particular I like the idea of using only one digit and the four operations (plus powers and parentheses). For example given 998 and 1. 998 = (111)^(1+1+1) 1 1 The hard part: having the smallest number of 1s used on the right side. And then doing the same with 2, 3 and so on. The mentioned video links to a paper with the solutions. It is still a nice challenge, so I will formalize it in some days. Calculator wise (we don't want to use the modern home supercomputers, do we?) Wikis are great, Contribute :) 

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