1. Joined
    31 Jan '09
    Moves
    4200
    17 Mar '10 20:48
    What row of numbers comes next in this series?


    1
    11
    21
    1211
    111221
    312211
    13112221
  2. Joined
    31 Jan '09
    Moves
    4200
    17 Mar '10 20:49
    if you want more puzzles ask me
  3. Joined
    05 Feb '09
    Moves
    968
    17 Mar '10 21:36
    Nice 🙂
    1113213211
  4. Joined
    15 Feb '07
    Moves
    667
    17 Mar '10 22:12
    Followed by 31131211131221
  5. Joined
    31 Jan '09
    Moves
    4200
    18 Mar '10 01:07
    Originally posted by SJPinder
    Nice 🙂
    1113213211
    very good. want more?????????
  6. Joined
    28 Mar '07
    Moves
    957
    18 Mar '10 07:38
    go for it, sloppy, post them all.
  7. Joined
    26 Apr '03
    Moves
    25238
    18 Mar '10 09:39
    This perl script outputs the first 10:

    my ($num,$last) = (1,10);
    for (my $n=1; $n<=$last; $n++) {
    print "entry $n is $num \n";
    my ($newnum, $lastchar, $count) = ('','',1);
    foreach my $char (split //, $num) {
    ($lastchar = $char, next) unless $lastchar;
    ($count++, next) if $char eq $lastchar;
    $newnum .= $count.$lastchar;
    $lastchar = $char;
    $count = 1;
    }
    $num = $newnum.$count.$lastchar;
    }

    That gives:

    entry 1 is 1
    entry 2 is 11
    entry 3 is 21
    entry 4 is 1211
    entry 5 is 111221
    entry 6 is 312211
    entry 7 is 13112221
    entry 8 is 1113213211
    entry 9 is 31131211131221
    entry 10 is 13211311123113112211
  8. Joined
    31 Jan '09
    Moves
    4200
    18 Mar '10 17:53
    Originally posted by iamatiger
    This perl script outputs the first 10:

    my ($num,$last) = (1,10);
    for (my $n=1; $n<=$last; $n++) {
    print "entry $n is $num \n";
    my ($newnum, $lastchar, $count) = ('','',1);
    foreach my $char (split //, $num) {
    ($lastchar = $char, next) unless $lastchar;
    ($count++, next) if $char eq $lastchar;
    ...[text shortened]... 12221
    entry 8 is 1113213211
    entry 9 is 31131211131221
    entry 10 is 13211311123113112211
    can anyone go one step further can give entry 11?
  9. Standard memberforkedknight
    Defend the Universe
    127.0.0.1
    Joined
    18 Dec '03
    Moves
    15971
    18 Mar '10 19:02
    Originally posted by sloppyb
    can anyone go one step further can give entry 11?
    Or more succinctly, the answer to this series is that entry n is a description of n-1.

    in the form <x><a><y><b>...

    where <x> is the number of consecutive characters <a>
    and <y> is the number of consecutive characters <b>
    etc.
  10. Joined
    26 Apr '03
    Moves
    25238
    18 Mar '10 20:095 edits
    Originally posted by sloppyb
    can anyone go one step further can give entry 11?
    Just edit the 10 in the first line of the script to 20 or whatever:

    entry 11 is 11131221133112132113212221
    entry 12 is 3113112221232112111312211312113211
    entry 13 is 1321132132111213122112311311222113111221131221
    entry 14 is
    11131221131211131231121113112221121321132132211331222113112211
    entry 15 is
    3113112221131112311311121321123113213221121113122113121113222123113221
    13212221
    entry 16 is
    1321132132211331121321133112111312211213211312111322211231131122211311
    12311332111213211322211312113211
    entry 17 is
    1113122113121113222123211211131221232112311311222112111312211311123113
    3221121321132132211331121321231231121113122113322113111221131221
    entry 18 is
    3113112221131112311332111213122112311311221112131221121321132132211231
    1311222113311213212322211211131221131211132221232112111312111213111213
    211231131122212322211331222113112211
    entry 19 is
    1321132132211331121321231231121113112221121321132122311211131122211211
    1312211312111322211213211321322123211211131211121332211231131122211311
    1231133211121312211231131112311211133112111312211213211321321112133221
    2311322113212221
    entry 20 is
    1113122113121113222123211211131211121311121321123113213221121113122113
    1211221321123113213221123113112221131112311332211211131221131211132211
    1213122112311311123112112322211213211321322113311213212312311211131122
    2112132113311213211231232112311311222112111312211312111312311211232211
    1213211322211312113211

    Notice the repeating patterns that start up in the first and last digits?
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