Mike Oakes wrote:

> Does this mean there is a limit of 60K digits somewhere in the // -f{$a}
> processing, perhaps?

abcfileformats.txt says "The current maximum line length for an
ABC, ABCD or ABC2 file is just under 16k."

This is actually 60000 characters in current versions:
http://groups.yahoo.com/group/primeform/message/5992
The limit is for all ABC lines and unrelated to -f.

> Meanwhile, is there anything I can do to get round it?

Avoiding long ABC lines seems to be the only possibility.
Scripts can do some things but maybe not the -f functionality you want.
Some of my programs write each number to a single-line file before
calling PFGW.
PFGW -q with a long command-line expression can have a much
lower OS-dependent limit.

--
Jens Kruse Andersen