

A131998


Numbers n such that the number of letters in the nth ordinal number divides n.


0



5, 7, 10, 24, 33, 40, 44, 70, 78, 84, 90, 99, 105, 126, 132, 168, 176, 189, 190, 198, 208, 210, 231, 252, 306, 315, 340, 360, 368, 384, 391, 408, 420, 441, 462, 480, 520, 546, 575, 580, 598, 600, 608, 612, 638, 682, 693, 700, 702, 736, 740, 760, 770, 792, 814
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OFFSET

1,1


COMMENTS

Which numbers k occur as the dividends?
k...smallest n such that A006944(n)/n = k.
1...5.
2..10.
3..11
4..44.
5..never?
6..78.
7..70.
8.168.
9.189.
10.90.
11.99.


LINKS

Table of n, a(n) for n=1..55.


FORMULA

{n such that A006944(n)n}.


EXAMPLE

a(1) = 5 because "fifth" has 5 letters.
a(2) = 7 because "seventh" has 7 letters.
a(3) = 10 because "tenth" has 5 letters and 10/5 = 2.
a(4) = 24 because "twentyfourth" has 12 letters and 24/12 = 2.
a(5) = 33 because "thirtythird" has 11 letters and 33/11 = 3.
a(6) = 44 because "fortyfourth" has 11 letters and 44/11 = 4.


CROSSREFS

Cf. A006944, A116910.
Sequence in context: A320447 A113194 A088768 * A141443 A215660 A015849
Adjacent sequences: A131995 A131996 A131997 * A131999 A132000 A132001


KEYWORD

easy,nonn,word


AUTHOR

Jonathan Vos Post, Oct 08 2007


EXTENSIONS

Corrected and extended by R. J. Mathar, Oct 24 2007


STATUS

approved



