IBM Research | Ponder This | March 2016 challenges

# Ponder This

## March 2016

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Ponder This Challenge:

This month's challenge is from Yan-Wu He (thanks!)
For a non-zero number (in list) (a1,a2,..,an), its square is (..., an,..,a2,a1),
Let's call the number N "squareversed" if its square ends with the reverse of N.
For example, N=69714 is "squareversed", since its square is 4860041796 which ends with 41796 (the reverse of N).
Find a 15 digits squarereversed number.
Bonus: Find a larger squarereversed number.

Update (07/03):

1. A solution with more than 20 digits will earn you a '**'.

We will post the names of those who submit a correct, original solution! If you don't want your name posted then please include such a statement in your submission!

We invite visitors to our website to submit an elegant solution. Send your submission to the ponder@il.ibm.com.

If you have any problems you think we might enjoy, please send them in. All replies should be sent to: ponder@il.ibm.com

Challenge: 28/02/2016 @ 12:00 PM EST
Solution: 01/04/2016 @ 12:00 PM EST
List Updated: 04/04/2016 @ 12:00 PM EST

**Robert Gerbicz (29/02/2016 12:00 PM IDT)
**Arthur Vause (29/02/2016 01:59 PM IDT)
*Armin Krauss (29/02/2016 02:19 PM IDT)
*Aviv Nisgav (29/02/2016 04:39 PM IDT)
Oleg Vlasii (29/02/2016 05:32 PM IDT)
Daniel Bitin (29/02/2016 05:54 PM IDT)
*Vladimir Sedach (29/02/2016 05:57 PM IDT)
Hao Zheng (29/02/2016 06:24 PM IDT)
**Mathias Schenker (29/02/2016 06:31 PM IDT)
*Joseph DeVincentis (29/02/2016 07:51 PM IDT)
**Lorenz Reichel (29/02/2016 10:57 PM IDT)
**Motty Porat (29/02/2016 11:11 PM IDT)
*Paolo Farinelli (29/02/2016 11:58 PM IDT)
Uoti Urpala (01/03/2016 01:10 AM IDT)
Radu-Alexandru Todor (01/03/2016 01:55 AM IDT)
**Jesse Rearick (01/03/2016 02:03 AM IDT)
Franciraldo Cavalcante (01/03/2016 03:04 AM IDT)
**David F.H. Dunkley (01/03/2016 03:07 AM IDT)
Victor Chang (01/03/2016 05:34 AM IDT)
Kang Jin Cho (01/03/2016 07:24 AM IDT)
Leo Broukhis (01/03/2016 10:56 AM IDT)
*Sergey Koposov (01/03/2016 01:00 PM IDT)
*Emir Haleva (01/03/2016 01:59 PM IDT)
**Harald Bögeholz (01/03/2016 04:03 PM IDT)
Alex Fleischer (01/03/2016 04:15 PM IDT)
Guang-Zhong Sun (01/03/2016 05:45 PM IDT)
**Dieter Beckerle (01/03/2016 08:53 PM IDT)
*Jan van Delden (01/03/2016 09:10 PM IDT)
*Nicolas Bitouze (01/03/2016 09:58 PM IDT)
*Boris Hartmann (01/03/2016 11:32 PM IDT)
**Justin C. Archer (02/03/2016 02:15 AM IDT)
*Benjamin Lui (02/03/2016 03:23 AM IDT)
Minxi Jiang (02/03/2016 05:17 AM IDT)
Tamir Ganor & Shouky Dan (02/03/2016 09:35 AM IDT)
Chris Shannon (02/03/2016 10:23 AM IDT)
**Ariel Ish-Shalom (02/03/2016 04:41 PM IDT)
*Rogerio Ponce da Silva (02/03/2016 05:34 PM IDT)
**Liubing Yu (02/03/2016 05:38 PM IDT)
*Lawrence Au (02/03/2016 08:28 PM IDT)
Reiner Martin (03/03/2016 12:24 AM IDT)
Cody Pfau (03/03/2016 12:42 AM IDT)
Alan Murray (03/03/2016 03:10 AM IDT)
**Amos Guler (03/03/2016 08:34 AM IDT)
Roberto Tauraso (03/03/2016 02:57 PM IDT)
*Tomáš Jurík (03/03/2016 03:29 PM IDT)
**Franciraldo Cavalcante (03/03/2016 05:33 PM IDT)
*José Eduardo Gaboardi de Carvalho (03/03/2016 06:11 PM IDT)
Clive Tong (03/03/2016 09:56 PM IDT)
*Kipp Johnson (03/03/2016 11:16 PM IDT)
*Bruce Norskog (04/03/2016 03:59 AM IDT)
*Hamidreza Bidar (04/03/2016 05:37 PM IDT)
*Alain Stephan (04/03/2016 06:12 PM IDT)
**Michael Rosola (04/03/2016 07:43 PM IDT)
Stéphane Higueret (05/03/2016 12:37 AM IDT)
**David Greer (05/03/2016 12:38 AM IDT)
**Gary M. Gerken (05/03/2016 10:19 AM IDT)
**Todd Will (06/03/2016 01:11 AM IDT)
*Chad Barb (06/03/2016 02:28 AM IDT)
Shirish Chinchalkar (06/03/2016 04:33 AM IDT)
*Peter Gerritson (06/03/2016 10:55 AM IDT)
Evert van Dijken (06/03/2016 04:46 PM IDT)
**Andrea Silva (06/03/2016 07:35 PM IDT)
*Yoav Kaempfer (07/03/2016 12:58 AM IDT)
Taylor Firman (08/03/2016 01:45 AM IDT)
**Rudy Cortembert (08/03/2016 04:23 PM IDT)
**Karim Alaoui (08/03/2016 09:58 AM IDT)
Hyun Min Victoria Woo (08/03/2016 11:09 PM IDT)
*Erik Wünstel (09/03/2016 09:15 AM IDT)
Christian Pfaffenzeller (09/03/2016 04:25 PM IDT)
Zhizhong Zhou (10/03/2016 07:22 AM IDT)
**Sami Casanova (10/03/2016 04:33 PM IDT)
**Andreas Stiller (10/03/2016 03:15 PM IDT)
**Aharon Malachi (10/03/2016 09:21 PM IDT)
**Yingtao Tian (11/03/2016 12:31 AM IDT)
**Raymond Lo (11/03/2016 03:39 AM IDT)
**Stefano Leucci (11/03/2016 02:27 PM IDT)
**Francis Golding (11/03/2016 07:34 PM IDT)
**Yury X Volvovskiy (11/03/2016 11:05 PM IDT)
*J. Eric Ivancich (12/03/2016 07:10 AM IDT)
David Stevens (12/03/2016 02:17 PM IDT)
**Emilio Del Tessandoro (12/03/2016 09:37 PM IDT)
**Jimmy Waters (13/03/2016 01:47 AM IDT)
*Matt Falk (13/03/2016 08:07 AM IDT)
**Raymond Jackson (14/03/2016 11:51 AM IDT)
Zhou Ding Wen (14/03/2016 04:01 PM IDT)
**Adrian Orzepowski (14/03/2016 08:25 PM IDT)
Bryce Fore (16/03/2016 09:46 AM IDT)
**Koszó Norbert (16/03/2016 02:15 PM IDT)
**Ram Shanker (17/03/2016 03:49 AM IDT)
*Chenzi Zhang (17/03/2016 08:32 AM IDT)
*Wolf M. (17/03/2016 10:07 PM IDT)
**Danny Scheinerman (17/03/2016 10:48 PM IDT)
**Tilo Anschütz (18/03/2016 09:16 AM IDT)
*Florian Fischer (19/03/2016 01:39 PM IDT)
**Nigel Brumpton (22/03/2016 08:35 AM IDT)
Daniel Chong Jyh Tar (23/03/2016 04:32 AM IDT)
*Fabian Lischka (23/03/2016 11:22 AM IDT)
*Pål Hermunn Johansen (23/03/2016 09:14 PM IDT)
Fabio Filatrella (27/03/2016 03:16 PM IDT)
**Paul Vishayanuroj (28/03/2016 01:23 AM IDT)
**Fabio Michele negroni (28/03/2016 02:46 PM IDT)
Di Luo (28/03/2016 06:25 PM IDT)
**Jamorn Horathai (29/03/2016 12:22 PM IDT)
Claudio Hüni (29/03/2016 05:48 PM IDT)
T.K. Chang (29/03/2016 09:30 PM IDT)
**Leandro Augusto de Araújo Silva (29/03/2016 11:41 PM IDT)
**Serge Batalov (30/03/2016 11:57 AM IDT)
**Tom MacDougall (30/03/2016 06:06 PM IDT)
Bruce M Fleischer (31/03/2016 02:13 AM IDT)
*Christof Mroz (31/03/2016 02:21 AM IDT)
Nguyen Ha Duy Henry (31/03/2016 06:08 PM IDT)
**Muralidhar Seshadri (31/03/2016 06:11 PM IDT)
Jason Lee (31/03/2016 07:05 PM IDT)
Dan Salajan (31/03/2016 10:55 PM IDT)
*Martin Sergio H. Faester (01/04/2016 01:45 AM IDT)
Oscar Volpatti (01/04/2016 05:34 AM IDT)
Junjiajia Long (01/04/2016 07:39 AM IDT)