- Ha Jan,

That's very very nice: indepently of eachother and generating the same suggestion!! How is it possible.

And your logic argument is very strong: indeed where is the logic when typing 1 = correct and writing 1 is wrong.

Best regards Jan.

Willem

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

Van: Jan van Koningsveld

Aan: MentalCalculation@yahoogroups.com

Verzonden: zondag 28 februari 2010 21:19

Onderwerp: Re: [Mental Calculation] calendar calculation

Dear Willem,

You suggested :

>The calculator has to write on his paper how he works:

This is what I suggested as well. Why is it allowed to type numbers when using a computer program, but when writing it on paper we have to use letters ? No logic here. Or is it ?

>1 = sunday, 2 = monday etc

>1 = monday, 2 = tuesday etc.

>1= saturday, 2 = sunday etc.

>and then behind the question mention the number he has calculated.

Kind regards

Jan

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

[Non-text portions of this message have been removed] - Good evening Willem,

Well mentioned. Plus, any 4 consecutive numbers of this sequence 11,6,5,6,11,6,5,6,11,6.., adds up to 28 which is the re-occurance number.(something like the frequency in Sinusoidal waves in physics)

Even the '11' gap can theoritically be split to 5.5.

I.e. between 2010 and 2021, the case '2015.5 October 3rd=Sunday' means that '2015 October 3rd=Saturday' and '2016-Oct-03=Monday' respectively.

So 2015.5, 2043.5 and 2071.5 can be embedded to the 14 number pattern in my previous message, if someone finds it helpful.

Best wishes

Nodas

--- In MentalCalculation@yahoogroups.com, "A.W.A.P. Bouman" <awap.bouman@...> wrote:

>

> Good afternoon Nodas,

>

> Aha, this is better!

> The sequence you mention is the famous 6, 5, 6,11 sequence, or in this case 6, 11, 6, 5. It was Robert Fountain who explained this to me.

>

> Regards,

>

> Willem

>

>

>

> ----- Oorspronkelijk bericht -----

> Van: Nodas Boukovalas

> Aan: MentalCalculation@yahoogroups.com

> Verzonden: dinsdag 9 november 2010 3:26

> Onderwerp: [Mental Calculation] Re: calendar calculation

>

>

>

> Dear Willem

>

> Nice insights, #28 is indeed the number of a calendar's re-occurance.

> (7 different days for the leap day that happens every 4 years)

>

> Though, in October's case there is no leap month concerned, so the case 'October 3rd = Sunday' calendars (to get 5 Fridays, 5 Saturdays ,5 Sundays) as it happens in 2010, can also happen exactly 14 times in this century. And, it has to do with years ending in 04,10,21,27,32, 38,49,55,60,66, 77,83,88,94.

>

> Regards,

> Nodas

>

>

> --- In MentalCalculation@yahoogroups.com, "A.W.A.P. Bouman" <awap.bouman@> wrote:

> >

> > Dear fellow calculators,

> >

> > In a small Dutch magazine an antropologist published a kind of table in which in October 2010 are mentioned 5 Fridays, 5 Saturdays and 5 Sundays.

> >

> > He says that this happens once in 823 years. Certainly he does not know that every 28 years the calendars are equal.

> >

> > My conclusion; the best he can do is stay an antropologist, and not participate in any tournament.

> > Unfortunately he published aninomously.

> >

> > Regards,

> >

> > Willem Bouman

> >

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

> >

>

>

>

>

>

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

>