mersenneforum.org Chalkdust crossnumber 07
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 2018-05-06, 19:21 #1 wflaherty99   May 2018 18 Posts Chalkdust crossnumber 07 If anyone could give solutions to some of these problems, that would be much appreciated! http://chalkdustmagazine.com/categor...s/crossnumber/
 2018-05-11, 11:42 #2 lavalamp     Oct 2007 Manchester, UK 2·683 Posts Here are some answers or possible answers: 2 & 11: Code: 153 370 371 407 4 & 5: 136 <--> 244 7: Code: 378 666 990 24: Code: 1634 8208 9474 26: 736 29: Code: 54748 92727 93084 Edit: No leading zeroes. Last fiddled with by lavalamp on 2018-05-11 at 12:23
 2018-05-11, 14:24 #3 lavalamp     Oct 2007 Manchester, UK 2×683 Posts 13: 426 8: 426^6 = 5976646846618176 12: 426^5 = 14029687433376 17: 224 22: 427 - 630 10: 427^5 - 630^5
 2018-05-12, 15:52 #4 lavalamp     Oct 2007 Manchester, UK 101010101102 Posts I've submitted my answer now. For anyone looking to compare answers, the MD5 hash for the sum of my accross clues is e8938a2d47a3f3c420478335278eb2e9. Another interesting point is that the answer is a semiprime equal to 5 * p16.
 2018-05-14, 23:17 #5 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 10011100010012 Posts My answer matches your 5XP16 For MD5....I tried 3 different MD5 generators and got 3 different answers but 1 matched yours. I think we match!!! I have to acknowledge that my son helped a ton and had the "BIG" calculator.
2018-05-15, 06:20   #6
lavalamp

Oct 2007
Manchester, UK

101010101102 Posts

Quote:
 Originally Posted by petrw1 I have to acknowledge that my son helped a ton and had the "BIG" calculator.
What's the "BIG" calculator? I used pari/gp for a few answers, is that what you mean?

2018-05-15, 09:28   #7
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

2·3,169 Posts

Quote:
 Originally Posted by lavalamp ... the MD5 hash is ... e8938a2d47a3f3c420478335278eb2e9. ... the answer is a semiprime equal to 5 * p16.
So all I have to do is hash all 16 and 17 digit numbers of the form 5*p16 and I can get the answer. Should be a doddle. brb

There are only 249,393,770,611,256 p16 numbers. Easy.

Last fiddled with by retina on 2018-05-15 at 09:35

2018-05-15, 15:15   #8
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3×1,667 Posts

Quote:
 Originally Posted by lavalamp What's the "BIG" calculator? I used pari/gp for a few answers, is that what you mean?
Java with BigInteger.

2018-05-15, 18:29   #9
lavalamp

Oct 2007
Manchester, UK

2·683 Posts

Quote:
 Originally Posted by petrw1 Java with BigInteger.
Ah, no need for that. All of these fit well inside a 64 bit int, you can get 19 digits in those.

Quote:
 Originally Posted by retina So all I have to do is hash all 16 and 17 digit numbers of the form 5*p16 and I can get the answer. Should be a doddle. brb There are only 249,393,770,611,256 p16 numbers. Easy.
Sadly do-able these days in a couple of hours with a 1080 Ti.

2018-05-15, 20:12   #10
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3×1,667 Posts

Quote:
 Originally Posted by lavalamp Ah, no need for that. All of these fit well inside a 64 bit int, you can get 19 digits in those.
Yes, he mentioned that after he was done.

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