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• ## Re: [Mental Calculation] Query: Possible world record for factoring six digit numbers....

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• Good morning Jerry, I just returned from Münster, where was the national championship MC for the younger children froim 9-16 years. Jan van Koningsveld, Gert
Message 1 of 7 , Nov 2, 2011
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Good morning Jerry,

I just returned from Münster, where was the national championship MC for the younger children froim 9-16 years.
Jan van Koningsveld, Gert Mittring and I gave some workshops, it was really great.

Factorisation: after deliberation with Ralf the decision was taken not to do factorisation of 4 digit numbers. Memory specialists could learn all the primes till 10.00 being 1219 by heart which would reduce the worthiness of the record, and so came out 5 digits.

6 Digits is very very ambitious. I'll ask Ralf to create a test set, which Ralf could send to you and copy to me.

You eg get 658389 which is definetly not simple. And surely a set of 10 numbers would be a heavy task.

But: really a challenge!

Best regards,

Willem

----- Oorspronkelijk bericht -----
Van: Jerry
Aan: MentalCalculation@yahoogroups.com
Verzonden: donderdag 27 oktober 2011 17:16
Onderwerp: [Mental Calculation] Query: Possible world record for factoring six digit numbers....

My proposal is to have a record for factoring ten six digit numbers. Does anyone have a program that can generate such sets? There also is no record for factoring four digit numbers but in that case, I think twenty is a reasonable number to factor as that is what was required for WIllem Bouman who holds the record for five digit numbers.

Perhaps there is room for the four digit record too. Below that, it seems too trivial to consider. Many of us, I guess, would need no time at all to factor a group of three digit numbers.

Jerry Newport

[Non-text portions of this message have been removed]
• Ralf, I have to agree that four digits is not suitable for a record. It is fun to do a bunch of them for demonstrations but Daniel Tammett, for one, knows all
Message 2 of 7 , Nov 2, 2011
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Ralf, I have to agree that four digits is not suitable for a record. It is fun to do a bunch of them for demonstrations but Daniel Tammett, for one, knows all of the primes below ten thousand. He sees them as different colors!! Daniel is an autistic savant who lives in England and has written some interesting books about his synesthesia, a condition in which senses cross each other. He sees numbers as different colors and memorized over 22 thousand digits of Pi.
I guess I will have to go after six digits or throw in the towel if nobody else changes the five digit record and go after that. I am in no hurry as my health is good and expect to be around a couple of more decades! Thanks for your feedback.
Jerry Newport
PS: i have sent a copy of this to Ralf too.

To: MentalCalculation@yahoogroups.com
From: awap.bouman@...
Date: Wed, 2 Nov 2011 10:37:14 +0100
Subject: Re: [Mental Calculation] Query: Possible world record for factoring six digit numbers....

Good morning Jerry,

I just returned from M�nster, where was the national championship MC for the younger children froim 9-16 years.

Jan van Koningsveld, Gert Mittring and I gave some workshops, it was really great.

Factorisation: after deliberation with Ralf the decision was taken not to do factorisation of 4 digit numbers. Memory specialists could learn all the primes till 10.00 being 1219 by heart which would reduce the worthiness of the record, and so came out 5 digits.

6 Digits is very very ambitious. I'll ask Ralf to create a test set, which Ralf could send to you and copy to me.

You eg get 658389 which is definetly not simple. And surely a set of 10 numbers would be a heavy task.

But: really a challenge!

Best regards,

Willem

----- Oorspronkelijk bericht -----

Van: Jerry

Aan: MentalCalculation@yahoogroups.com

Verzonden: donderdag 27 oktober 2011 17:16

Onderwerp: [Mental Calculation] Query: Possible world record for factoring six digit numbers....

My proposal is to have a record for factoring ten six digit numbers. Does anyone have a program that can generate such sets? There also is no record for factoring four digit numbers but in that case, I think twenty is a reasonable number to factor as that is what was required for WIllem Bouman who holds the record for five digit numbers.

Perhaps there is room for the four digit record too. Below that, it seems too trivial to consider. Many of us, I guess, would need no time at all to factor a group of three digit numbers.

Jerry Newport

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]
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