insert a sequence

Dear postgres Users,
I have a simple question I think.
I have a table that contains some columns
one of these columns (the columns ID) contains distinct integer
values ...
I need to insert into this table some other records but I only need that
values were inserted into the ID column and that they were
progressive... (a sequence starting from 100 and ending to 300, step=1)
the other columns must remains null....
can I do this with a sequence and then an "insert into"?

many thanks

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Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a
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Perugia (Italy)
e-mail: marchesini(at)unipg(dot)it
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