# Puzzle - First to solve wins

For years I've had an idea in my head about a way to hide some information in a bunch of numbers. I actually got around to coding an implementation and figured I'd run a competition. The first person who figures out what the famous landmark is described by the second set of numbers below and posts the correct answer in the comments wins $100.

## The hint

Here's a hint. The following numbers are a reference to the Eiffel tower:

4553646346

7163137311

4444444444

3533111353

7144180895

7554606920

4434600814

7464570980

7163467974

0219310519

7950817691

5184417729

7425410889

8416910894

9683869683

5181105841

9921217329

7711707519

5522255221

7283683678

6351431634

0880550085

8284542671

8180641529

1583298708

6382210450

0884411780

8395118896

4321914924

6755565555

8040114081

6795106458

8555514328

7036572955

8571951791

7055417910

6211020186

3766902289

6615501362

7885290157

9609996376

2222222182

7007701647

1211383251

9002040829

0827967720

6253765670

6387775389

4621018370

7777977779

5550875485

4048668410

0831881300

2331611326

9810417552

9639365723

5684458045

9219346694

9264556599

9910391319

0889488380

2621421666

3039430433

6606866066

1647276442

3018836303

7929577557

5924502135

6660820050

3616220506

3627394521

6946354448

8553533699

8263393761

6993513804

9359366517

6283336323

8932523822

9563835579

9049449404

4355353553

6883495205

1385972454

6379472763

0383949556

1593753551

0333443333

6305965050

5189119519

6873002700

4454454453

5146591451

1881118881

4427774742

0039854653

3436991881

3674778781

5076978682

5101868852

3506505636

6646111646

7208838702

9571355713

4917635623

4658011846

2766858612

6165155612

7970474626

3419121409

7249120838

7268493396

9365162207

3245132152

6915111116

9319090113

7068004800

3461114641

3196261169

0148556554

7617261767

9772777777

3148566764

3491559762

9518733453

9541517028

9791701576

## The puzzle

Given the above hint, what famous landmark do the numbers below refer to?

7819920991

0382807057

9822860091

9019944629

7268972869

7061970606

9689196999

0814207182

9382838888

4547034742

4061557423

3288299540

2120897402

0222334202

5709459704

6544997643

6446446422

3393433549

4270976786

1977803402

3741273019

1711476716

1190991005

7719571659

7630578350

1777303716

4666846082

7597997997

9151991995

6519596695

4207993297

9225566199

4597901087

4515993600

6599572123

9299155361

2556129887

5563917407

3857110206

0553907397

7753135711

0366733377

5558252555

1827982139

3551353335

0643119370

3543154931

7531035676

3533928034

7557997755

3533113313

4641046164

0848287808

3943223343

0112524501

0064631760

7777878768

6293390362

6675038700

4605074391

6735978781

1724038788

0972028702

3435833834

5044554515

0291711299

1109999191

5490967630

1645813636

7404930502

2639582465

3409856093

5227670208

8530553335

8177010505

0540121189

1534113143

0177078077

8320603033

5846055504

1256756712

5742959559

0914491110

8333738888

5074555575

5044703314

0084969005

0012980966

9011530603

2084564221

1633998451

1995936672

4075871312

2171948562

4195313943

0223922033

1017411114

8671998496

2933883299

2161780029

6141762415

2627793347

1627780833

6127572751

2647777444

3161888619

9125757251

1283727238

9495886249

8403884439

9992568021

8415700641

0702772107

9445225442

9493893949

5918281522

8015800880

0376733615

4444616210

4062406845

3688835835

0011310130

6652685625

0957507645

3101003718

6666836828

Post the answer as a comment below. ~~The first person to answer correctly with an acceptable explanation to how the answer was reached (rather than just a guess) wins $100, so make sure to use your correct e-mail address so I can contact you.~~

**Note #1:** People have noted that the numbers change whenever the page is reloaded. That's as expected. This puzzle is *not* an *encryption* as much as it is an *obfuscation*. That the numbers change is not important, as only the pattern in them will lead to the answer, which is of course constant.

**Note #2:** There was a bug in my post for a short while, which made the hint and puzzle basically the resolve to the same answer. This is fixed now. If you saved a copy the numbers before, just grab a fresh set.

## Solved!

The second landmark was discovered by Batuhan Bozkurt, congratulations! The challenge has not yet been met entirely, though so I've decided to set a new challenge with the same method. ~~The same $100 prize applies~~.

Redditor Bearasaurus has solved the final challenge too! For hints, check the followup post.

## Comments

Big Ben

I'm afraid Big Ben is not it. But be sure to include some explanation as to how the answer was reached, so I know it isn't just a random guess.

I "solved" your puzzle, but I assume not in the way you wanted.

After giving it quite some hours, I failed to find any specific pattern (with a reasonable kolmogorov complexity) that would lead me to an answer. But in Reddit, you mentioned that you would be interested in statistical approaches that would lead to an answer (which I assume you are interested for increasing the security of the obfuscation?) so I exploited the fact that your website gives fresh batch of numbers at each reload so I grabbed about 1000 sets (with intervals in between, hopefully not causing trouble to your website, it handled the requests like a champ) and got to cracking.

Now your HTML formatting implies 10x10 blocks of data for each set. So that was a starting point when I first began looking at the problem. The grid is 70 x 20 so that implies 14 secret codes, 7 for each row.

I looked for what was common for each 10x10 block in each of the samples I gathered from your site. I found out that for each 10x10 block some digits occasionally never appears; for example in block 0x 0y, not all digits have to appear but one always appears at least once.

Once I looked at the remaining digits (that are common in all blocks at a particular coordinate), for the "hint", I was faced by these digits:

0485130

0021739

These are the coordinates in the form of degrees-minutes-seconds (dddmmss as you gave away generously in Reddit) of Eiffel Tower.

Once I ran the same process for the puzzle, the result was:

0295845

0310804

Which is the coordinates for the Great Pyramid of Giza.

Maybe this is disappointing, I don't know. If the website hadn't provided fresh batch of numbers, this method would not work. I assume, to strengthen the obfuscation, you could make sure one digit always appears at least once; but as long as the distribution isn't random, I suppose the answer could be extracted.

I've tried many approaches before this; I'm pretty confident that the pattern is not based on neighborhood relationships (as the answer can appear on edges, though wrapping around could be employed but still with it I failed to detect any patterns). I think it doesn't have anything (or much) to do with arithmetic on the digits (like summing / subtracting them). I tried various row/column patterns and couldn't come up with anything.

I also analyzed the 10x10 blocks containing the answer digits only once (so if the answer is 0 for that block, 0 appears only once in that block). But saw no obvious pattern at all. So this beats me in that regard.

If I am eligible for the prize for my answer, I would kindly ask you to donate it to the Doctors Without Borders foundation. If you are uncomfortable about it for some reason, you can choose to donate it somewhere else you see fit.

Thanks for the challenge, and although my curiosity has been partly satisfied, I'm still waiting for the answer that will allow me to solve this using a pen and paper using a single set of numbers.

Batuhan, the answer is indeed correct. The Great Pyramid of Giza is the one I was looking for. The method you used is indeed not the one I was hoping for, as you haven't actually figured out the way the coordinates are encoded into the sets of numbers.

Still, I'm not one to dictate how the problem should be solved. I will make a donation to Doctors Without Borders for $100 in your name and post proof that I have done so.

Since I would very much like for somebody to solve the method, I'm including this static problem for a second attempt, and another $100. Being in a comment, the following set obviously does not change and encodes a third landmark.

2626513077384364666346599932245309032974209496921885110948315551555613

6549028370497764766953274173448611231555969009312435020244378244262894

9308377132331493394457637801172312372974892873367485438142538547446457

5987478672136633636156339295109196283474021313920015080695500005010510

9318473400638833698356337893287640679475088481921818727043921551931599

5758758671181690400516397336912974972974211231362065019596695870416497

1701226107698865022553554534544375771374969996927993180831110067651597

3203310324331357320447629709425333533533932743923435767555759732852649

0008077080336367751344339394399228589625005440340517458583553308156594

7467243472134765226056779555595344734475199118911888022882025906466417

0332300493776667648725560571112261196221231229957486429403779342535143

1366338577707417047142278890548676887286598087756091175002210326130060

5863902088494574497542911473583959753975898054668946115111760583633056

3673921092972792959782223331128568968982838265801286279605628360969080

5301986352763553665223261861393193111359891776463941295493449120391390

0463999640662807648743557375531417213379281451584481179187119326988940

4352555243298062697573961379660934698929891289118894828988929160129317

1871110111741174649945428445570098658283038728302510575750510526949009

3326333663020967498782260828822839081251556075505536114445618120357157

5602990599311067698721073220721651596922796029092045295295550390501233

The challenge now is to find the answer and a step by step description of how to extract the correct digits from it.

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