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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)



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. Adams-Watters, Aug 06 2009]


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


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.


Cf. A002963, A005589.

Sequence in context: A068388 A205712 A093711 * A187713 A101082 A277706

Adjacent sequences:  A163667 A163668 A163669 * A163671 A163672 A163673




Jonathan Vos Post, Aug 02 2009


Missing 55 and 95 added by Franklin T. Adams-Watters, Aug 06 2009

Slightly edited by Charles R Greathouse IV, Oct 05 2009



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Last modified November 22 15:27 EST 2017. Contains 295089 sequences.