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a(2n-1) = n+2, a(2n) = smallest number requiring n+2 letters in English.
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%I #8 Oct 21 2018 13:51:01

%S 3,1,4,4,5,3,6,11,7,15,8,13,9,17,10,24,11,23,12,73,13,3000,14,11000,

%T 15,15000,16,101,17,104,18,103,19,111,20,115,21,113,22,117,23,124,24,

%U 123,25,173,26,323,27,373,28,1104,29,1103,30,1111,31

%N a(2n-1) = n+2, a(2n) = smallest number requiring n+2 letters in English.

%C Uses number forms containing "and"; that is, "one hundred and one" rather than "one hundred one". - _Sean A. Irvine_, Oct 20 2018

%Y Cf. A000916, A001166, A014388, A045494, A045495.

%K nonn,word,easy

%O 1,1

%A Jacques Haubrich (jhaubrich(AT)freeler.nl)

%E More terms from _Sean A. Irvine_, Oct 20 2018