A000916 a(2n) = n+2, a(2n-1) = smallest number requiring n+2 letters in English.

1, 3, 4, 4, 3, 5, 11, 6, 15, 7, 13, 8, 17, 9, 24, 10, 23, 11, 73, 12, 3000, 13, 11000, 14, 15000, 15, 101, 16, 104, 17, 103, 18, 111, 19, 115, 20, 113, 21, 117, 22, 124, 23, 123, 24, 173, 25, 323, 26, 373, 27, 1104, 28, 1103, 29, 1111, 30

Offset

1,2

Comments

Requires presence of "and" at appropriate place, e.g. "one hundred and one" [Sean A. Irvine, Aug 29, 2011].

Links

Table of n, a(n) for n=1..56.

Crossrefs

Cf. A001166, A014388, A045494, A045495.

Sequence in context: A222430 A222275 A355017 * A323846 A014241 A199185

Adjacent sequences: A000913 A000914 A000915 * A000917 A000918 A000919

Keyword

nonn,word,easy

Author

Jacques Haubrich (jhaubrich(AT)freeler.nl)

Extensions

More terms from Sean A. Irvine, Aug 28 2011

Status

approved