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A163670 Numbers whose English name (excluding spaces and hyphens) is written with only straight line segments (chisel strokes). 4

%I #4 Mar 30 2012 18:40:50

%S 5,9,10,11,12,15,19,20,25,29,50,55,59,90,95,99

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

%C 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.

%C 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]

%e 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.

%Y Cf. A002963, A005589.

%K easy,fini,full,nonn,word

%O 1,1

%A _Jonathan Vos Post_, Aug 02 2009

%E Missing 55 and 95 added by _Franklin T. Adams-Watters_, Aug 06 2009

%E Slightly edited by _Charles R Greathouse IV_, Oct 05 2009

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Last modified May 2 17:46 EDT 2024. Contains 372203 sequences. (Running on oeis4.)