Comments on: A pair of prime puzzles http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/ Education, Math, Teaching, New York, Bronx, Union, Language, Travel Mon, 16 Nov 2009 16:03:43 +0000 http://wordpress.com/ hourly 1 By: mathmom http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35481 mathmom Sat, 09 Feb 2008 23:59:54 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35481 You may not be able to create a number, but <a href="http://www.langston.com/Fun_People/1995/1995AYU.html" rel="nofollow">you can patent one</a>! You may not be able to create a number, but you can patent one!

]]> By: jd2718 http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35470 jd2718 Sat, 09 Feb 2008 17:23:52 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35470 Correction: German mathematician Leopold Kronecker (1823–1891) is reported to have said, "God created the natural numbers; all the rest is the work of man." Correction:

German mathematician Leopold Kronecker (1823–1891) is reported to have said, “God created the natural numbers; all the rest is the work of man.”

]]> By: jd2718 http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35469 jd2718 Sat, 09 Feb 2008 17:23:14 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35469 Yes, and hmm. I can write "To be or not to be..." Now, if I claimed to be the first... Likewise, I can create a number. But I cannot claim that it is a new creation. (I know, I know, I am on shaky ground here). Was it Dedekind who said: "God created the naturals, all else is man's creation"? Yes, and hmm.

I can write “To be or not to be…” Now, if I claimed to be the first…

Likewise, I can create a number. But I cannot claim that it is a new creation. (I know, I know, I am on shaky ground here).

Was it Dedekind who said: “God created the naturals, all else is man’s creation”?

]]> By: ki http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35396 ki Thu, 07 Feb 2008 18:17:44 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-35396 Easy, if you specify that two digits can repeat (there are about four such numbers.) If they can't then there is no answer. Note: might ask if one can "find" a number since they've all been "created" for some time now. Easy, if you specify that two digits can repeat (there are about four such numbers.) If they can’t then there is no answer.

Note: might ask if one can “find” a number since they’ve all been “created” for some time now.

]]> By: JD2718 » Leftovers http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-960 JD2718 » Leftovers Tue, 15 Aug 2006 01:04:35 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-960 [...] Not food.  Puzzles.  Before I start new puzzles for the fall, I want to clear out the old ones from the Spring.  There are three on this site that didn’t have solutions posted. Here they are. I will post solutions next week. A prime puzzle:  Can you create a 3-digit number such that the number and all other numbers formed by premutations of its digits, are prime?  (eg, 127 is prime, and 271 is prime, but 172, 217, 721, and 712 are not…)  How many such numbers are there?  (May 27) Photographer Puzzle:  photographer takes about 15 seconds to line up a group of people and take their photo. Faced with a group of 4 people, and a little extra time, he decides to take their photo in every arrangement possible (this guy always lines them up in 1 row, and never leaves gaps). How long will it take to take all the photos? Guess before you do the math, always more fun that way. [...] [...] Not food.  Puzzles.  Before I start new puzzles for the fall, I want to clear out the old ones from the Spring.  There are three on this site that didn’t have solutions posted. Here they are. I will post solutions next week. A prime puzzle:  Can you create a 3-digit number such that the number and all other numbers formed by premutations of its digits, are prime?  (eg, 127 is prime, and 271 is prime, but 172, 217, 721, and 712 are not…)  How many such numbers are there?  (May 27) Photographer Puzzle:  photographer takes about 15 seconds to line up a group of people and take their photo. Faced with a group of 4 people, and a little extra time, he decides to take their photo in every arrangement possible (this guy always lines them up in 1 row, and never leaves gaps). How long will it take to take all the photos? Guess before you do the math, always more fun that way. [...]

]]> By: jd2718 http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-114 jd2718 Tue, 30 May 2006 21:59:16 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-114 Opps. You're not missing a thing. I meant 29. Managed to count the wrong way from 31. Thanks for pointing that out. Opps.
You’re not missing a thing. I meant 29. Managed to count the wrong way from 31. Thanks for pointing that out.

]]> By: john http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-113 john Tue, 30 May 2006 20:50:07 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-113 Difference of 33? The only way that can happen is if one's even and one's odd. The only even prime is 2, which would make the other one 35. Which isn't prime. What am I missing? Difference of 33? The only way that can happen is if one’s even and one’s odd. The only even prime is 2, which would make the other one 35. Which isn’t prime. What am I missing?

]]> By: jd2718 http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-112 jd2718 Tue, 30 May 2006 04:25:20 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-112 jd2718 at gmail dot com. I just got a new computer (went over to mac) and can't figure out why your page looks so different. Mosaic is fine - there's a fine mosiac museum in Antakya, old Antioch, in the part of Turkey that descends the Mediterranean coast towards Lebanon and that was briefly independent as the Hatay Republic between the world wars, and looks nothing like the fictional desert Hatay Republic that shows up in Raiders of the Lost Ark - {inhale} (Turkey on the brain) - Mosaic is fine, but the side bars have disappeared and I can't back navigate, and I am sure I dropped some math comments, maybe Peano stuff? in some older posts. I just checked - your site looks fine on the pc. I'll figure out the mac mess jd2718 at gmail dot com.

I just got a new computer (went over to mac) and can’t figure out why your page looks so different. Mosaic is fine – there’s a fine mosiac museum in Antakya, old Antioch, in the part of Turkey that descends the Mediterranean coast towards Lebanon and that was briefly independent as the Hatay Republic between the world wars, and looks nothing like the fictional desert Hatay Republic that shows up in Raiders of the Lost Ark – {inhale} (Turkey on the brain) – Mosaic is fine, but the side bars have disappeared and I can’t back navigate, and I am sure I dropped some math comments, maybe Peano stuff? in some older posts.

I just checked – your site looks fine on the pc. I’ll figure out the mac mess

]]> By: Myrtle http://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-111 Myrtle Tue, 30 May 2006 04:13:08 +0000 https://jd2718.wordpress.com/2006/05/27/a-pair-of-prime-puzzles/#comment-111 Hi JD, have you got an email address where you can be reached? Hi JD, have you got an email address where you can be reached?

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