

lboudreau Loyal user Alexandria, Virginia 288 Posts 
"Somehow, I always had a head for numbers. At a young age, I found that I could tell what number someone had in mind by merely knowing whether it was odd or even. I've tried to put that peculiar talent to work in picking lottery numbers."
Following those remarks, I produce a card on which the following numbers are printed in big, bold characters: 1593067, 5072401, 9463812, 6802501 9372845, 8593756, 4163389, 1502034 8072723, 7293690, 3802289, 7163690 5072478, 8502756, 2463190, 6372501 8593723, 1502067, 6372534, 2463167 1593034, 3802256, 8072756, 4163312 6802534, 7293623, 9463845, 8502723 9372812, 7163623 After showing everybody the numbers, I hand a person the card. I ask the person to select any one of the numbers mentally. "Look at the center of your selected number," I instruct, "the fourth digit to be precise, and tell me whether that digit is odd or even. '0' is an even number, by the way." As soon as the person answers, I write a number on a sketch pad and show it to the audience. This is repeated for the other digits, until I've written down the entire number. The person then reads his number aloud for the first time and it matches mine perfectly. The method is a unique numbergenerating routine. Let's say the person selected the number 6372501. I begin with the center digit because that digit has just two possibilities, 3 or 2. The person will tell me it's even, so the digit has to be a 2, which I will write on the sketch pad. Working backwards from the center digit, I ask him whether the third digit is odd or even. He will say it's odd. I will reproduce it by using one of the following rules: (a) Add 6 to the last digit I wrote if that digit is odd and the next digit is odd. (b) Add 3 if the last digit is odd and the next digit is even. (c) Add 5 if the last digit is even and the next digit is odd. (d) Add 8 if the last digit is even and the next digit is even. Rule (c) applies because the last digit I wrote was a 2, which is even, and the next digit (the third digit) is odd. So I add 5 to 2 and get 7. Next, I either write the 7 on a sketch pad at once or ask the audience to call out odd digits at random and write it down when I hear it. The result is 72. The second digit comes next. The person will report that the second digit is odd, which means rule (a) comes into play and I must add 6 to 7, for a total of 13. I will drop the 1 and write the 3 as the second digit, giving me the number 372. Applying the appropriate rule to the first digit, then to the last digit of the number, I will get 6372xx1. To get the two unknown digits (xx), I will ask the person to concentrate on them without stating whether they're odd or even. I subtract 1 from the first digit, 6, to get the fifth digit and I subtract 1 from the last digit, 1, to get the sixth digit  yielding the complete number 6372501.
LEO

Slim King Eternal Order Orlando 17647 Posts 
Some Lottery magazines print the winning numbers for the last month on the back page of their latest issue. This would dress up this effect nicely, since there are thirty numbers total. ( It would have to be some kind of lottery that only selects single digits) I do see another way to do the odd even questions, but perhaps it's too basic. Couldn't you ask five questions, odd or even, and know which number(Position) it was....then look and see it on your reference sheet? You could just ask the questions and then write the number down right then.
Just a thought. Great Idea! Thanks Dave
THE MAN THE SKEPTICS REFUSE TO TEST FOR ONE MILLION DOLLARS.. The Worlds Foremost Authority on Houdini's Life after Death.....

Andy Moss Special user 710 Posts 
The below is just a variant to Leo's (Iboudreau) effect "Number divination".
This humble effect seems to hold hidden potential since it can be performed for one person or more, on stage or even via the computer.The binary code is very well hidden.If you like the take then please feel free to present it yourself in your own way.Here goes. "NUMBER DIVINATION REVISITED". "The 30 numbers" (The actual numbers have been slightly reformed to look more random with respect to the last two digits) 1593947 5072381 9463792 6802481 9372725 8593636 4163269 1502914 8072603 7293570 3802169 7163570 5072358 8502636 2463070 6372481 8593603 1502947 6372414 2463047 1593914 3802136 8072636 4163292 6802414 7293503 9463725 8502603 9372792 7163503 "The Rules"(have remained the same as for the original) Add 8 to the last digit written if that digit is even and the next digit is even. Add 6 to the last digit written if that digit is odd and the next digit is odd. Add 5 to the last digit written if that digit is even and the next digit is odd. Add 3 to the last digit written if that digit is odd and the next digit is even. "Method of calculation" (Changes for the calculation of the fifth and sixth digits) Apply the above rules starting with the fourth digit (if odd=3 if even=2). Ditto with third, second, first and finally seventh digits. Then for the fifth digit take 2 away from the first digit. For the sixth digit take 3 away from the seventh digit. "A purer presentation" (This is where the real changes lie) Ask the spectator to tell you which of his digits (e.g. “1st, fourth and fifth” ) are odd. Instruct the spectator to form a number with these digits and to visualise this number in her mind‘s eye. The performer claims he will try to tune in to the mind of the spectator. Then ask the spectator to do the same for her even digits (but this time you need not ask her where they lie in digit order).That is to say you ask the spectator simply to form a number with the digits and then to visualise the number. Again the performer affects concentration whilst ‘tuning in’ to the spectator’s mind. Naturally the performer by now has all the information he requires to formulate the whole number all at once seemingly through his psychic ability to read the spectator‘s 'mind images' of her actual numbers. There is no need to laboriously move from fourth to third then to second etc which is suspicious since it is clearly more natural to start with the first digit in any such process of divination. The two visualisations act as a red herring and add a further layer of disguise to the ‘fishing’ for the binary code. The above is only a skeleton for a possible presentation for Leo's effect as inspired by him. I do hope that it is food for thought. With best wishes Andy. 
lboudreau Loyal user Alexandria, Virginia 288 Posts 
Andy, I love it. Why didn't I think of that? I posted the number divination in “Magical Equations” because I saw it as something a math teacher might have fun with. In fact, a math teacher did tell me once how he enjoyed performing it for his students. You've transformed it into a wonderful psychic demonstration, way cooler than the original. Kudos!! Thank you for taking time to write it up and sharing it with us.
LEO

Philzimt New user 11 Posts 
Thank you Leo and Andy for the generosity of sharing your ideas with us. Very inspirational!

Nevbar1 New user 4 Posts 
Hi Leo / Andy,
Thanks for posting this  I've only recently come across it but really think it has potential. I'm enjoying playing with it and I haven't even started sharing it yet. Just a question about the fifth and sixth digits  could you explain why the pattern breaks down and why it was necessary to have the alternate process for these two positions? Apologies if it is glaringly obvious... 
hcs Elite user Germany, Magdeburg 445 Posts 
Hello Leo, hello Andy,
I've only recently come across kudos for the ideas.
Melencolia I  Magic Squares for the Mental Entertainer * Smart Methods for 4x4, 5x5 and 6x6 Magic Squares * 180 A4pages * version 3.51

ekgdoc Regular user 106 Posts 
Quote:
On May 24, 2009, Andy Moss wrote: I really like the way Andy quickly gets the needed information at the start of the presentation. Everything that follows is smoke. But there are a few things that have bothered me. Suppose the participant chooses the number 1593947. Then the odd digits are: first, second, third, fourth, fifth, and seventh. If the participant rattled these off quickly, it might be hard to remember. And it would not make sense for the performer to write anything down at this point. Also, the presentation makes it obvious that almost all the numbers are odd, which could be perceived by spectators as a clue to the method. Finally, if you ask the participant which digits are odd, they might give you the value of the digit rather than its position. So how the performer words the critical question is, well, critical. I propose the following presentation which makes things easier for both performer and participant. After a number is selected, the performer remarks that the participant is thinking of a large number and asks if it is even or odd. The spectator answers (EVEN, say). (The performer now knows the parity of the seventh digit.) The performer continues, "The number you are thinking of is a very large number. So let's start by focusing on the first four digits. Of the first four digits, which ones are EVEN?" Once the participant answers, the performer has all the information needed to determine the number. Blow a bunch of smoke and reveal. Kudos to Leo and Andy for some great thinking! David M. 
ekgdoc Regular user 106 Posts 
Quote:
On Sep 24, 2020, Nevbar1 wrote: Leo and Andy have not posted in a while, but you ask a good question. You can apply the rules for the fifth and sixth digits. This leads to more possible numbers, but there will also be more repeated patterns (eg, multiple numbers may have the same first four digits). Also, there would be an increase in the complexity of calculating the final number. I wrote a computer program that generates the numbers. I may try some different rules and/or increase the number length to see if something interesting comes out. David M. 
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