Composites, emirps, and emirpimes among de Polignac numbers (A006285)
Richard Mathar
mathar at strw.leidenuniv.nl
Thu Jun 19 18:28:02 CEST 2008
seems too mute, one could add something louder, like
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From: Richard Mathar <mathar at strw.leidenuniv.nl>
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To: seqfan at ext.jussieu.fr
Subject: Re: Re: Composites, emirps, and emirpimes among de Polignac numbers (A006285)
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local a,f,bline,b ;
# List intially empty
a := [] ;
f := fopen(bfilename,READ) :
bline := readline(f) :
while length(bline) > 0 do
# Skip lines with comments
if StringTools[FirstFromLeft]("#",bline ) <> 0 then
;
else
# interpret the line contents as two integers (index and value)
b := sscanf( bline,"%d %d") ;
# grab the second component of each line, the value; append
a := [op(a),op(2,b)] ;
fi ;
bline := readline(f) ;
od:
fclose(f) ;
RETURN(a) ;
local ifs ;
ifs := convert(n,base,10) ;
add( op(-i,ifs)*10^(i-1),i=1..nops(ifs)) ;
p := 0 ;
for i from 0 to 999 do
if isprime( op(1000*t+i+1,poli) ) then
p := p+1 ;
fi ;
od:
printf("%d %f\n",t,p/1000.0) ;
p := 0 ;
for i from 0 to 999 do
c := op(1000*t+i+1,poli) ;
if isprime( c) and isprime(rev(c)) then
p := p+1 ;
fi ;
od:
printf("%d %f\n",t,p/1000.0) ;
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Date: Thu, 19 Jun 2008 23:41:13 -0400
From: "N. J. A. Sloane" <njas at research.att.com>
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To: seqfan at ext.jussieu.fr
Subject: Number of letters in word for n in various languages
Cc: njas at research.att.com, vinay at research.att.com
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Date: Thu, 19 Jun 2008 21:33:28 -0700
From: "Max Alekseyev" <maxale at gmail.com>
To: SeqFan <seqfan at ext.jussieu.fr>
Subject: a new Wagstaff prime
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A new Wagstaff (probable) prime has been found: (2^986191+1)/3.
Currently it takes the 4th place in PRP Records:
http://www.primenumbers.net/prptop/prptop.php
Please update A000978
Regards,
Max
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