login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A124172 Triangle in which row n contains values from 1 to n in alphabetical order (in English). 0
1, 1, 2, 1, 3, 2, 4, 1, 3, 2, 5, 4, 1, 3, 2, 5, 4, 1, 6, 3, 2, 5, 4, 1, 7, 6, 3, 2, 8, 5, 4, 1, 7, 6, 3, 2, 8, 5, 4, 9, 1, 7, 6, 3, 2, 8, 5, 4, 9, 1, 7, 6, 10, 3, 2, 8, 11, 5, 4, 9, 1, 7, 6, 10, 3, 2, 8, 11, 5, 4, 9, 1, 7, 6, 10, 3, 12, 2, 8, 11, 5, 4, 9, 1, 7, 6, 10, 13, 3, 12, 2 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

This is a fractal sequence: if the first instance of each number is deleted, the original sequence is recovered. - Franklin T. Adams-Watters, Nov 24 2013

While it is unlikely to ever make a practical difference, for the sake of definiteness we specify that standard American number names are to be used. - Franklin T. Adams-Watters, Nov 24 2013

For 100th row, "one"=50th value and "one hundred"=51st value, placing the extremes in the center. - Peter Woodward, Jun 27 2015

LINKS

Table of n, a(n) for n=1..91.

EXAMPLE

Triangle begins:

1,

1,2,

1,3,2,

4,1,3,2

5,4,1,3,2

5,4,1,6,3,2,

...

MATHEMATICA

names = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen"}; Flatten[Table[Table[Position[names, Sort[Take[names, n]][[i]], 1, 1][[1, 1]], {i, n}], {n, Length[names]}]] (* T. D. Noe, Nov 25 2013 *)

CROSSREFS

Cf. A002260.

Sequence in context: A332899 A331521 A244967 * A058933 A087470 A191475

Adjacent sequences:  A124169 A124170 A124171 * A124173 A124174 A124175

KEYWORD

nonn,tabl,word

AUTHOR

Colm Mulcahy, Dec 05 2006

EXTENSIONS

Edited name and more terms from Franklin T. Adams-Watters, Nov 24 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 31 15:41 EDT 2020. Contains 334748 sequences. (Running on oeis4.)