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A305100 Least nonnegative integer which requires n letters to spell in Turkish excluding spaces and hyphens.

%I A305100 #29 Sep 01 2025 11:12:55
%S A305100 3,1,4,0,14,18,21,24,28,68,124,128,168,224,228,268,468,868,1268,1468,
%T A305100 1868,2268,2468,2868,4868,8868,14868,18868,21868,24868,28868,68868,
%U A305100 124868,128868,168868,224868,228868,268868,468868,868868,1068868,1124868,1128868,1168868
%N A305100 Least nonnegative integer which requires n letters to spell in Turkish excluding spaces and hyphens.
%H A305100 Sezai Ata, <a href="https://doi.org/10.13140/RG.2.2.19342.87363">MATLAB program</a>, 2018.
%H A305100 Wikibooks, <a href="https://en.wikibooks.org/wiki/Turkish/Numbers">Turkish numbers</a>
%H A305100 <a href="/index/Lc#letters">Index entries for sequences related to number of letters in n</a>
%e A305100 a(2) = 3: "üç", a(3) = 1: "bir", a(5) = 0: "sıfır"
%o A305100 (Python)
%o A305100 from num2words import num2words
%o A305100 from itertools import count, islice
%o A305100 def f(n): return sum(1 for c in num2words(n, lang='tr') if c.isalpha())
%o A305100 def agen(): # generator of terms
%o A305100     n, adict = 2, dict()
%o A305100     for k in count(0):
%o A305100         v = f(k)
%o A305100         if v not in adict:
%o A305100             adict[v] = k
%o A305100             while n in adict:
%o A305100                 yield adict[n]
%o A305100                 n += 1
%o A305100 print(list(islice(agen(), 44))) # _Michael S. Branicky_, Sep 01 2025
%Y A305100 Turkish version of A134629.
%Y A305100 Cf. A057435.
%K A305100 nonn,word,changed
%O A305100 2,1
%A A305100 _Sezai Ata_, May 25 2018
%E A305100 a(16)-a(41) from _Daniel Suteu_, May 26 2018
%E A305100 a(42)-a(45) from _Michael S. Branicky_, Sep 01 2025