Lucky Numbers - Wolfram Demonstrations Project
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Around 1955 Stanislaw Ulam identified the lucky number sequence 1 3 7 9 13 15 21 25 31 33 37 …. Start with the odd numbers 1 3 5 7 9 11 13 15 17 19 21 … and keep 1 in the sequence. The next number is 3; strike out every third number from the beginning so that the sequence is 1 3 7 9 13 15 19 21 …. This strikes out 5 11 17 23 and so on. The ;;
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Roman Numerals - Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/GoldbachConjecture/img/popup_1.png)
Goldbach Conjecture - Wolfram Demonstrations Project
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Lucky Numbers - Wolfram Demonstrations Project
![](https://walkingrandomly.com/images/mathplayer/gibbs.jpg)
Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/GraphsOfTheSuccessiveDigitsOfRationalNumbers/img/popup_2.png)
Graphs of the Successive Digits of Rational Numbers - Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/LuckyNumbers/img/thumbnail_3.png)
Lucky Numbers - Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/DoubleHelix/img/popup_1.png)
Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/CentroidOfAnArbitraryHexagon/img/CentroidOfAnArbitraryHexagon.png)
Factorizing Mersenne Numbers - Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/DynamicsOfMaximalEntropyRandomWalkAndGenericRandomWalkOnCayl/img/popup_1.png)
Dynamics of Maximal Entropy Random Walk and Generic Random Walk on Cayley Trees - Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/NumbersInVariousBases/img/popup_2.png)
Numbers in Various Bases - Wolfram Demonstrations Project
![](https://demonstrations.wolfram.com/GraphsOfTheSuccessiveDigitsOfRationalNumbers/img/popup_3.png)
Graphs of the Successive Digits of Rational Numbers - Wolfram Demonstrations Project
![](https://content.wolfram.com/sites/43/2011/08/image-11.jpg)
WolframAlpha Comes Alive with CDF—Stephen Wolfram Writings
![](https://mhreviews.files.wordpress.com/2010/11/mathematica-8-browser-plugin-3-olympus-mons.png?w=584)
Wolfram Mathematica 8 Review (April 27, 2011)