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Re: Newbie - Trying to Help a Friend

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From Dave Angel <davea@davea.name>
Subject Re: Newbie - Trying to Help a Friend
Date Wed, 20 Nov 2013 00:54:28 -0500
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On 20 Nov 2013 03:52:10 GMT, Steven D'Aprano <steve@pearwood.info> 
wrote:
> 2 does count because it isn't divisible by 3. The question states, 
> "[count] how many positive integers less than N are not divisible 
by 2,3 
> or 5". Two is not divisible by 3, so "not divisible by 2,3 or 5" is 
true, 
> so two gets counted.

> The first number which is divisible by *all* of 2, 3 and 5 (i.e. 
fails 
> the test, and therefore doesn't get counted) is 30. The next few 
that 
> fail the test are 60, 90, 120, 150, 180, 210, 240, 270, 300, ... 
> Remember, these are the numbers which should not be counted.

> > I count 1, not 6

> Out of curiosity, which number did you count?

1 of course. It's the only one that's not divisible by any of the 
factors.

Apparently we disagree about precedence and associativity in English. 
I believe the not applies to the result of (divisible by 2, 3, or 5), 
so I'd count 1, 7, 11, 13, 17, 19, 23. The first nonprime would be 
49.

If I were trying to get the series you describe, I'd phrase it as 
  "Not divisible by 2, and not divisible by 3, and not divisible by 5"

-- 
DaveA

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Thread

Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-19 10:40 -0800
  Re: Newbie - Trying to Help a Friend maxwell34m@gmail.com - 2013-11-19 11:05 -0800
  Re: Newbie - Trying to Help a Friend Neil Cerutti <mr.cerutti@gmail.com> - 2013-11-19 14:07 -0500
  Re: Newbie - Trying to Help a Friend Gary Herron <gary.herron@islandtraining.com> - 2013-11-19 11:06 -0800
  Re: Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-19 11:27 -0800
    Re: Newbie - Trying to Help a Friend Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-19 20:48 +0000
      Re: Newbie - Trying to Help a Friend Duncan Booth <duncan.booth@invalid.invalid> - 2013-11-20 11:38 +0000
        Re: Newbie - Trying to Help a Friend Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-23 02:03 +0000
    Re: Newbie - Trying to Help a Friend Mark Janssen <dreamingforward@gmail.com> - 2013-11-19 14:51 -0800
  Re: Newbie - Trying to Help a Friend Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-20 00:17 +0000
    Re: Newbie - Trying to Help a Friend Dave Angel <davea@davea.name> - 2013-11-19 22:10 -0500
      Re: Newbie - Trying to Help a Friend Steven D'Aprano <steve@pearwood.info> - 2013-11-20 03:52 +0000
        Re: Newbie - Trying to Help a Friend Dave Angel <davea@davea.name> - 2013-11-20 00:54 -0500
          Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 09:29 +0000
            Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 13:57 +0000
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:51 +0000
                Re: Newbie - Trying to Help a Friend Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-20 18:33 -0500
                Re: Newbie - Trying to Help a Friend Anssi Saari <as@sci.fi> - 2013-11-21 15:44 +0200
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:49 +0000
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-21 02:05 +1100
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:06 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:09 +0000
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-21 02:14 +1100
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:35 +0000
                Multiple postings Alister <alister.ware@ntlworld.com> - 2013-11-20 15:36 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:34 +0000
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 16:29 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 16:45 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 09:12 -0800
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 17:37 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 09:51 -0800
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 18:09 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 10:18 -0800
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 18:35 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 11:54 -0800
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-21 07:26 +1100
                Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-21 00:27 +0000
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] MRAB <python@mrabarnett.plus.com> - 2013-11-21 00:48 +0000
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] Tim Golden <mail@timgolden.me.uk> - 2013-11-21 09:08 +0000
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to   Help a Friend] Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-11-22 17:10 +1300
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] Chris Angelico <rosuav@gmail.com> - 2013-11-21 20:46 +1100
                Re: Newbie - Trying to Help a Friend Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-11-21 12:53 +0100
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-22 02:48 +1100
                Re: Newbie - Trying to Help a Friend Neil Cerutti <mr.cerutti@gmail.com> - 2013-11-21 11:29 -0500
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-22 04:10 +1100
                Re: Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-21 15:17 -0800
                Re: Newbie - Trying to Help a Friend Gary Herron <gary.herron@islandtraining.com> - 2013-11-21 15:35 -0800
                Re: Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-21 15:55 -0800
                Re: Newbie - Trying to Help a Friend Terry Reedy <tjreedy@udel.edu> - 2013-11-21 19:55 -0500
                Re: Newbie - Trying to Help a Friend Gary Herron <gary.herron@islandtraining.com> - 2013-11-21 20:17 -0800
                Re: Newbie - Trying to Help a Friend Terry Reedy <tjreedy@udel.edu> - 2013-11-21 19:17 -0500
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:34 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:06 +0000
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 15:24 +0000
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:50 +0000
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:50 +0000
          Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 09:29 +0000

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