The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A190300

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A190300

Composite numbers that are not Brazilian.
(history; published version)

#76 by OEIS Server at Wed Apr 17 11:48:36 EDT 2019

LINKS

Robert Israel, <a href="/A190300/b190300_1.txt">Table of n, a(n) for n = 1..10000</a> (first 208 terms from Robert G. Wilson v)

#75 by Bruno Berselli at Wed Apr 17 11:48:36 EDT 2019

STATUS

proposed

approved

Discussion

Wed Apr 17

11:48

OEIS Server: Installed new b-file as b190300.txt.  Old b-file is now b190300_1.txt.

#74 by Robert Israel at Wed Apr 17 11:14:27 EDT 2019

STATUS

editing

proposed

#73 by Robert Israel at Wed Apr 17 11:14:04 EDT 2019

MAPLE

filter:= proc(n)

local b, x, t0;

for b from 2 while b^3 < n do

x:= n; t0:= n mod b;

while x > 0 do

if x mod b <> t0 then break fi;

x:= (x - t0)/b;

od;

if x = 0 then return false fi;

od;

true

end proc:

select(filter, [4, 6, 9, 25, 49, seq(ithprime(i)^2, i=26..100)]); # Robert Israel, Apr 17 2019

STATUS

proposed

editing

#72 by Robert Israel at Wed Apr 17 11:09:04 EDT 2019

STATUS

editing

proposed

#71 by Robert Israel at Wed Apr 17 11:08:42 EDT 2019

LINKS

Robert G. Wilson v, Israel, <a href="/A190300/b190300_1.txt">Table of n, a(n) for n = 1..10000</a> (first 208</a> terms from Robert G. Wilson v)

MAPLE

filter:= proc(n)

local b, x, t0;

for b from 2 while b^3 < n do

x:= n; t0:= n mod b;

while x > 0 do

if x mod b <> t0 then break fi;

x:= (x - t0)/b;

od;

if x = 0 then return false fi;

od;

true

end proc:

select(filter, [4, 6, seq(ithprime(i)^2, i=2..100)]); # Robert Israel, Apr 17 2019

STATUS

proposed

editing

#70 by Omar E. Pol at Mon Apr 15 16:27:50 EDT 2019

STATUS

editing

proposed

#69 by Omar E. Pol at Mon Apr 15 16:27:46 EDT 2019

COMMENTS

Composite numbers that are not Brazilian are exactly Also semiprimes that are not Brazilian. - Bernard Schott, Apr 11 2019

STATUS

proposed

editing

#68 by Michel Marcus at Sun Apr 14 12:55:15 EDT 2019

STATUS

editing

proposed

#67 by Michel Marcus at Sun Apr 14 12:55:12 EDT 2019

COMMENTS

Composite Numbers numbers that are not Brazilian are exactly semiprimes that are not Brazilian. - Bernard Schott, Apr 11 2019

STATUS

proposed

editing