A159451 - OEIS

A159451

Number of numbers less than n, that are contained in n written as English number names.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 3, 3, 3, 3, 3, 2, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 2, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 2, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 2, 3, 3, 3

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OFFSET

0,22

COMMENTS

a(A159452(n)) = 0;

a(A159453(n)) = n and a(m) <> n for m < A159453(n).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Robert G. Wilson v, English names for the numbers from 0 to 11159 without spaces or hyphens

EXAMPLE

n = 19 -> nineteen: a(19) = #{nine} = 1;

n = 20 -> twenty: a(20) = #{} = 0;