4 ms·
The On-Line Encyclopedia of Integer Sequences
- nrkn 16y agoInteresting you should post this, I just made a submission relating to my discovery of OEIS: http://news.ycombinator.com/item?id=2496701 http://news.ycombinator.com/item?id=2496701
- Pinckney 16y agoA great resource! If you don't have time to peruse it in depth, they have a 8.5 minute video which runs through 1000 sequences. It starts out a little slow, but some of the later examples are quite bizarre. http://www.youtube.com/watch?v=LCWglXljevY http://www.youtube.com/watch?v=LCWglXljevY
- franze 16y agoA059893 Reverse the order of all but the most significant bits in binary expansion of n. n = 1ab..yz -> 1zy..ba = a(n). is awesome http://oeis.org/A059893 http://oeis.org/A059893, look at the scatterplot http://oeis.org/A059893/graph http://oeis.org/A059893/graph
- cscheid 16y agoThis is "because" those correspond exactly to the Hammersley sequence, a well-known quasi-random sequence of points: http://mathworld.wolfram.com/HammersleyPointSet.html http://mathworld.wolfram.com/HammersleyPointSet.html
- est 16y agoBy Neil Sloane at AT&T research http://www.research.att.com/~njas/ http://www.research.att.com/~njas/ I also discovered it from HN[1] :) [1]: http://news.ycombinator.com/item?id=579925 http://news.ycombinator.com/item?id=579925
- mturmon 16y agoIts first editions were in paper format: http://www.amazon.com/Encyclopedia-Integer-Sequences-N-Sloane/dp/0125586302 http://www.amazon.com/Encyclopedia-Integer-Sequences-N-Sloan... and the original, from 1973, http://www.amazon.com/Handbook-Integer-Sequences-N-Sloane/dp/012648550X/ref=ntt_at_ep_dpi_2 http://www.amazon.com/Handbook-Integer-Sequences-N-Sloane/dp...
- eqdw 16y agoI once was doing a project euler challenge of some sort, and I had to find the nth term of some sequence. My code for generating the sequence was taking too long (order of hours), and I didn't feel like googling. So I downloaded the sequence from oeis and output the correct term. Problem Solved!