6 ms·
Find your birthday (or any other number) in pi ...
- RiderOfGiraffes 17y agoMy birthday occurs at position 157,396,201, using the ISO date format.
- MattF 17y agoMine's at 177,322,565
- RevRal 17y agoPosition 21,786,098 Who can get closest to zero?
- deleted 17y ago[deleted]
- m_eiman 17y agoWriting a bit of code that'll find the first valid ISO date should be easy enough, then we'll just need to find someone who was born that day…
- jonp 17y ago29021960 appears starting at digit 713. Wikipedia lists Khaled, Algerian raï musician; Richard Ramirez, American serial killer; Tony Robbins, American motivational speaker as being born on 29 February 1960. Oddly searching for 29021960 doesn't return a result. But searching for 2902196 does and shows there's a zero after it.
- gjm11 17y agoISO format is yyyymmdd, not ddmmyyyy. First recent ISO date in pi is 19530921 at the 417th decimal place. All Wikipedia has for that date is the birth of a musician and recording engineer called Andy Heermans.
- nuclear_eclipse 17y agoThe string 19850427 occurs at position 5,438,413
- naish 17y agoI'm at 1,251,501 if I exclude the century (19); otherwise, my DOB is not to be found.
- dkokelley 17y agoI lose: The string 19880316 occurs at position 59,056,088
- atlbeer 17y agoThe string 31182 occurs at position 118,017 counting from the first digit after the decimal point. The 3. is not counted. 3-11-82
- pingswept 17y agoThis isn't true in a strict sense, is it? The digits of pi aren't random, and for numbers of arbitrary size, it seems that you could just keep asking for a longer numbers until you can't find a match any more. Ah, we know that none of the numbers of the form pi + x can found in pi. But I still wonder whether there exist numbers of finite length that can't be found within the digits of pi. Any hardcore mathematicians in the house?
- brown9-2 17y agoRelated: http://www.angio.net/pi/whynotpi.html http://www.angio.net/pi/whynotpi.html
- DeusExMachina 17y agoI'm not a mathematician, but I read a lot of time ago that since pi is infinite but not periodic, you shold be able to find in it any sequence you want, given infinite time to search in it. This is what I remember, but I could be wrong.
- zackattack 17y agoYou can't find 1/9 in pi. 1/9 precludes the possibility of any other sequence.
- staticshock 17y agoI think the parent was talking about sequences of digits, i.e. integers, not just "any rational number"
- deleted 17y ago[deleted]
- alphaBetaGamma 17y agoThe statement (infinite && not periodic) ==> (any finite sequence is in it) is not true. \a number could have a decimal expansion that is not periodic but does not include certain digits. E.g: write Pi in binary and consider the same sequence of 0's and 1's as a number in decimal
- pook 17y agoRMS's birthday is today. "The string 03161953 occurs at position 30,263,003 counting from the first digit after the decimal point."
- deleted 17y ago[deleted]
- mcantor 17y agoPage is worth it for this nugget: Be warned that 50 million digits of pi takes up 50 megabytes. This can take up to 4 hours to download with a 28.8k modem!
- RiderOfGiraffes 17y agoFor those who are interested: It is conjectured that pi is "normal" in the sense that the digits occur with equal liklihood. Making that statement precise is exceedingly hard, and not very enlightening. EDIT: philh points out that the full definition of "normal" says that every block occurs equally often (a concept that needs care to make formally correct) and that does imply that every finite sequence does occur. pi is known to be transcendental. It is not only not rational (cannot be expressed as the ratio or integers (although 355/113 is close and you can get as close as you like by using bigger numbers)) but it is also not the root of any polynomial with integer coefficients (rationals being a special case). The digits of pi cannot become periodic. None of the above is enough to show that every finite number occurs "eventually". As an example, consider the number: 0.123 112233 111222333 111122223333 111112222233333 ... Here the digits 1 through 3 occur equally often, it never becomes periodic, it is transcendental, and yet the sequence 321 will never occur. Now instead of using 1 through 3, generalise to using 1 through 9. It is generally believed that the digits are "effectively random" which means any finite sequence will occur with probability 1, but the observations made above are not enough to ensure that. (EDIT: although the full definition of "normal" does, rather thanthe limited version I originally put - thanks to philh for the correction). (edited a typo 133 -> 113 : thank you for the correction)
- ilitirit 17y ago> although 355/133 is close and you can get as close as you like by using bigger numbers 355/113
- RiderOfGiraffes 17y agoCorrected - thanks.
- philh 17y ago>It is conjectured that pi is "normal" in the sense that the digits occur with equal liklihood. That's only part of it. You need that every block occurs as often as every other block of equal length. So every digit occurs as often as every other digit; every pair of digits occurs as often as every other pair; every triple occurs as often as every other triple; and so on. So the number you give is not normal in base 3. A consequence of normality is that every finite sequence of digits eventually appears. http://en.wikipedia.org/wiki/Normal_number http://en.wikipedia.org/wiki/Normal_number
- araneae 17y agopi doesn't have my phone number (in the first 200000000 digits) I'm so sad.
- kmano8 17y agoAlso doesn't have my bday.. 04221986
- daten 17y agoWeird. If I "See 10 digits starting at position 186,557,264", the result is: 8912345678 But if I search for that result, it doesn't find it. If I search for 12345678 it finds it and you can see 89 before it. Why can't I search for that number?
- python_kiss 17y agoI created a version of my own: http://jawadonweb.com/projects/pi http://jawadonweb.com/projects/pi :)
- arethuza 17y agoI wonder where the first item of "intellectual property" exists in pi (suitably encoded, of course)?
- eru 17y agoDepends on how much leeway you allow in encoding..
- tocomment 17y agoI always find it weird to think that I'm in pi somewhere. The exact position of every atom in my body at every moment of my life. Maybe I'm getting the math wrong though?
- huhtenberg 17y agoThe string 718281828 did not occur in the first 200000000 digits of pi after position 0. Why am I not surprised? :)
- tel 17y agoThere's almost a 1 in 10 chance of seeing any 9 digit string (according to the website), so it might be a little bit surprising at least.
- frankus 17y agoIt couldn't find "help I'm trapped in a universe factory" in the first two million digits.