

A163670


Numbers whose English name (excluding spaces and hyphens) is written with only straight line segments (chisel strokes).


4



5, 9, 10, 11, 12, 15, 19, 20, 25, 29, 50, 55, 59, 90, 95, 99
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

There are no elements in the sequence beyond 99 because of curves in writing hUnDReD, thOUSanD, milliOn, BilliOn, and so forth. If one counts the segments (chisel strokes) then 29 is the unique fixed point of that derived sequence.
Specifically, these are the numbers whose names use only the letters A, E, F, H, I, K, L, M, N, T, V, W, X, Y, and Z. [From Franklin T. AdamsWatters, Aug 06 2009]


LINKS

Table of n, a(n) for n=1..16.


EXAMPLE

a(1) = 5 because FIVE is the smallest integer whose English name is written with only straight line segments. 6 is not in the sequence because the letter S has curves. a(2) = 9 because NINE is the next integer whose English name is written with only straight line segments.


CROSSREFS

Cf. A002963, A005589.
Sequence in context: A314583 A205712 A093711 * A187713 A101082 A277706
Adjacent sequences: A163667 A163668 A163669 * A163671 A163672 A163673


KEYWORD

easy,fini,full,nonn,word


AUTHOR

Jonathan Vos Post, Aug 02 2009


EXTENSIONS

Missing 55 and 95 added by Franklin T. AdamsWatters, Aug 06 2009
Slightly edited by Charles R Greathouse IV, Oct 05 2009


STATUS

approved



