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TI-Basic Brain Teasers => TI-BASIC
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mr. sir

Newbie

Joined: 21 Feb 2008
Posts: 41

 Posted: 18 May 2008 04:47:16 pm    Post subject: My challenge for you today is to write a program to ask for the lower and upper bounds, then find and display, one at a time, all prime numbers within that range. My pathetic attempt was at about 249 bytes... Hopefully you can do better.
Weregoose
Authentic INTJ

Super Elite (Last Title)

Joined: 25 Nov 2004
Posts: 3976

 Posted: 18 May 2008 05:29:23 pm    Post subject: If you're going for size, this one is 43 bytes: Spoiler wrote:Prompt A,B For(A,A,B If min(1=gcd(A,seq(A,A,2,√(A Disp A EndThe lower bound must be greater than three; the upper bound less than 1+106. A probabilistic test might be better for assessing larger numbers quickly.Last edited by Guest on 18 May 2008 05:36:09 pm; edited 1 time in total
justusdude

Joined: 24 May 2006
Posts: 265

 Posted: 18 May 2008 06:04:58 pm    Post subject: Here's mine. Spoiler wrote:Prompt N For(A,1,N Output(1,1,A N/A->B If fPart(B )=0 Then For(C,2,A-1 If fPart(A/C)=0 Then A->C 0->A End End If A=/=0 Disp A Pause End End
DarkerLine
ceci n'est pas une |

Super Elite (Last Title)

Joined: 04 Nov 2003
Posts: 8328

 Posted: 18 May 2008 06:08:13 pm    Post subject: What number range would we be dealing with, here? Most interesting prime numbers are too big to fit entirely in a floating-point variable.
Weregoose
Authentic INTJ

Super Elite (Last Title)

Joined: 25 Nov 2004
Posts: 3976

 Posted: 18 May 2008 06:27:45 pm    Post subject: justusdude wrote:Here's mine.That outputs prime factors of the input. Check the first post again to see what is sought by the challenge.Last edited by Guest on 18 May 2008 06:28:31 pm; edited 1 time in total
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