cp's OEIS Frontend

A037196 Number of vowels in the American English name of n.

%I A037196 #24 Jul 08 2025 22:04:28
%S A037196 2,2,1,2,2,2,1,2,2,2,1,3,2,3,4,3,3,4,4,4,1,3,2,3,3,3,2,3,3,3,1,3,2,3,
%T A037196 3,3,2,3,3,3,1,3,2,3,3,3,2,3,3,3,1,3,2,3,3,3,2,3,3,3,1,3,2,3,3,3,2,3,
%U A037196 3,3,2,4,3,4,4,4,3,4,4,4,2,4,3,4,4,4,3,4,4,4,2,4,3,4,4,4,3,4,4,4,4,6,5,6,6
%N A037196 Number of vowels in the American English name of n.
%C A037196 "American English" means that there is no "and" in the names of numbers, cf. example. - _M. F. Hasler_, Aug 26 2020
%e A037196 a(20) = 1 for "twEnty" with 1 vowel: 'y' does not count.
%e A037196 a(101) = 6 for "OnE hUndrEd OnE" with 6 vowels: no "and" as in the "British" variant "one hundred and one" which would have 7 vowels.
%o A037196 (PARI) vowels=Vec("aeiou"); apply( {A037196(n)=#[c|c<-Vec(English(n)),setsearch(vowels,c)]}, [0..104]) \\ see A052360 for English(). - _M. F. Hasler_, Aug 26 2020
%o A037196 (Python)
%o A037196 from num2words import num2words
%o A037196 def a(n): return sum(1 for c in num2words(n).replace(" and", "") if c in "aeiou")
%o A037196 print([a(n) for n in range(105)]) # _Michael S. Branicky_, Mar 23 2025
%Y A037196 Cf. A005589, A052360 (number of letters in English name of numbers with/without spaces and dashes).
%Y A037196 Sequences related to vowels: A102869, A158352, A158354 (smallest number with n [distinct] vowels in AE / BE), A158353, A158355 (ditto, increasing), A058179 (all 5 vowels), A058180 (ditto, exactly once), A000852, A000861 (start/end with vowel), A019270, A080518 (self-describing), A059437, A079741, A152592, A174879, A241858, A332068, A332069.
%K A037196 nonn,word,easy
%O A037196 0,1
%A A037196 _N. J. A. Sloane_
%E A037196 More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000
%E A037196 Name edited and crossrefs added by _M. F. Hasler_, Aug 26 2020
%E A037196 a(19)=4 corrected by _Sean A. Irvine_, Dec 16 2020