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A168085 a(n) = the smallest number whose Welsh name in the traditional Vigesimal System contains n letters of the alphabet. 1

%I

%S 1,2,3,7,4,12,11,13,21,16,14,27,24,19,31,33,73,36,34

%N a(n) = the smallest number whose Welsh name in the traditional Vigesimal System contains n letters of the alphabet.

%C The table below shows the derivation of the sequence:

%C ..n..Smallest.Number..Welsh.Name

%C ..2.........1.........un

%C ..3.........2.........dau.(m)./.dwy.(f)

%C ..4.........3.........tair.(f)

%C ..5.........7.........saith

%C ..6.........4.........pedwar.(m)./.pedair.(f)

%C ..7........12.........deuddeg

%C ..8........11.........un.ar.ddeg

%C ..9........13.........tri.ar.ddeg

%C .10........21.........un.ar.hugain

%C .11........16.........un.ar.bymtheg

%C .12........14.........pedwar.ar.ddeg

%C .13........27.........saith.ar.hugain

%C .14........24.........pedwar.ar.hugain

%C .15........19.........pedwar.ar.bymtheg

%C .16........31.........un.ar.ddeg.ar.hugain

%C .17........33.........tri.ar.ddeg.ar.hugain

%C .18........73.........tri.ar.ddeg.a.thrigain

%C .19........36.........un.ar.bymtheg.ar.hugain

%C .20........34.........pedwar.ar.ddeg.ar.hugain

%H TAKASUGI Shinji, <a href="http://www.sf.airnet.ne.jp/~ts/language/number/traditional_welsh.html">The Number System of Welsh (Traditional)</a>

%K nonn,word

%O 2,2

%A _Christopher Hunt Gribble_, Nov 18 2009

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Last modified September 28 07:53 EDT 2022. Contains 357063 sequences. (Running on oeis4.)