A164796 - OEIS

%I #10 Feb 02 2021 22:47:38

%S -1,-1,0,4,1000000000000,4000000000000,3000000000000,43,23,24,74,

%T 24000000000000,103,104,303,304,3004,143,123,124,174,324,374,1103,

%U 1104,1303,1304,3303,1143,1123,1124,1174,1324,1374,3324,3374,11374,13324,13374,17374,23324

%N a(n) is the smallest number whose English name has the letter "r" in the n-th position, or -1 if no such number exists.

%e a(3)=0 ("zeRo"), a(4)=4 ("fouR"), a(5)=1000000000000 ("onetRillion"), a(13)=103 ("onehundredthRee").

%Y Cf. A164789 ("o"), A164790 ("e"), A164791 ("n"), A164792 ("t").

%Y Cf. A164793 ("i"), A164794 ("f"), A164795 ("h"), A164797 ("u").

%K word,sign

%O 1,4

%A _Claudio Meller_, Aug 26 2009

%E a(24) and beyond from _Michael S. Branicky_, Feb 02 2021