1,1

The 'ij' in 'vijf' has been counted as one letter here. Counting it as one or two letters are both common in Dutch. - AndrĂ© Engels, Dec 07 2003

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Table of n, a(n) for n=1..71.

Index entries for sequences related to number of letters in n

A090589 gives the sequence when 'ij' is counted as two letters.

Sequence in context: A279781 A262827 A143490 * A280356 A018244 A113311

Adjacent sequences: A007482 A007483 A007484 * A007486 A007487 A007488

nonn,word

N. J. A. Sloane.

approved