Missing numbers

Hello list,

I need to track down the missing check numbers in a serie, table
contains a column for check numbers and series like this:

dbalm=# select doc_numero,doc_ckseriesfk from bdocs where doc_cta=1
dbalm-# and doc_tipo='CHE' order by doc_numero;
  doc_numero | doc_ckseriesfk
------------+----------------
  19200      |         856938
  19201      |         856938
  19215      |         856938
  19216      |         856938
  19219      |         856938

Missing numbers are:
from 19202 to 19214 and 19217,19218


Does anyone knows a way to get that done in SQL or plpgsql, thanks in
advance


--
Sinceramente,
Josué Maldonado.

... "De hecho el paso de compilación a objeto suele atravesar una fase
intermedia en que se genera un fichero en lenguaje ensamblador y se
invoca al programa ensamblador del sistema." -- Tutorial de C