Alan Robert Boyd - Obituary.

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don mcdonald

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Jan 2, 1999, 3:00:00 AM1/2/99
to Taylor, Bill -- Bill Taylor, Michael Chemistry Pent in O, letter to ed//chief reporter, Vicki Hyde (ed) nz Science mthly, pan...@actrix.gen.nz

--
don s mcdonald | loto adviser + maths | results / 640 pers'lised nos.
wellington2, new zealand | +64 4 389 6820.
hiNT R.eply-to: dsmc...@actrix.gen.nz
formerly don.mc...@welcom.gen.nz n.b. suppress ".ld".

On Sat, 2 Jan 1999, Don McDonald wrote:

>
> OBITUARY.
>
> Alan Robert BOYD
> number theorist
> d. Hamilton N.Z. 1.1.1 999,
> aged 47 years.
>
>
>
> The most prolific mathematician of the
> 20th century, Paul Erdos, described
> the mathematician species as a device
> for turning coffee into theorems.
>
> Judging by the cup stains on Alan Boyd's
> letters to me, Alan, who died this year, practised a lot of
> number theory. Just before Christmas 1998
> Alan requested a disk of Acorn computer
> programs from me; he wanted to hire a
> computer. Although I did a few short
> calculations for Alan, he usually produced
> his own printouts, photocopying one side
> of the paper and copying dozens of columns of figures
> by hand in pen or pencil on the reverse side.
> He was the human printer computer.
>
> Alan studied sequences of integers.
> Hati numbers are integers
>
> 2^a .3^ b.N
>
>
> where a+b is even, and N is a whole number
> not divisible by 2 or 3.
>
> A few Hati numbers are
> 1 = 2^0 .3^0 a+b= 0
> 4 = 2^2 a+b = 2
>
> 6 = 2^1 .3^1 a+b= 2
>
> 9= 3^ 2 a+b= 2
> and 20 = 2^2 .5. a+b= 2.
>
>
>
> On my kitchen wall Alan gave me a colour
> coded array of Hati nos. up to 100.
>
> Alan taught me about Panarithmic numbers
> and Boyd numbers and I introduced him to
> primitive roots. He gave me a program.
> Can you do this
> program on your computer? I could.
>
> Alan arrived on the doorstep of my
> Newtown, Wellington, bedsit flat from Dunedin.
> He may have seen my ads in nz science mthly
> magaz. and was referred to me by
> the maths dept at Canterbury University.
>
> Every year he travelled to the North
> Island for NZ Scrabble championships.
> And he visited contacts in Wellington,
> including a brother in Lower Hutt and
> myself.
>
> Later he moved to Hamilton. Another
> habit that Alan briefly pursued was
> mailing press cuttings about bizarre incidents
> or Court proceedings. His research was
> published rarely in NZ mathematics magazine.
>
> Alan was the first pedestrian killed on
> NZ roads in 1 January 1999. A Z (alpha and
> omega.) It is presumed that he was the
> victim of a hit-and-run driver.
>
> by
> DON S McDonald
>
> 63/5 hut chi son rd
> newtown wellington. 2
> new zealand
> call minder 64 (4) 389 6820.
>
>
> date: 27.12.98 15:33 nzdt.
> subject: nextprime bin(300,150)+185.
> ng: sci.math reference, finding large prime nos.
>
> PRIME p divides bin(2n,n) + mp
> IFF there exists any k >=0
> such that Floor(2n/p^k) = Odd.
>
> Whence, nextprime = 2^300/root(150pi)
> = bin(300,150) +185 = 9.384E88
> contains no prime factor < 300.
>
> bin = nCr = n! / r!(n-r)!
> power of
> .. in 300! 150!
> 2 150
> 4 75 37
>
> 3 100
> 9 33 16
>
> 5 60
> 25 12
> 125 2
>
> 7 42
> 49 6
>
> 37 8
>
> --
> / don.
> dsmc...@actrix.gen.nz
> (644 welgtn n. zeal) 389-6820.
>
>


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