[chaley]

Originally Posted by DrChiper

This comes to mind in the GUI search field:

template:"""{series_index}#@#:n:1"""

FWIW: this does the same thing using standard calibre search syntax.

series:true and series_index:=1

It is possible that the first book in the series doesn't have index 1. This template search finds the lowest index in each series.

template:"""program:
	vals = globals(vals='');
	if !vals then
		all_series = book_values('series', 'series:true', ',', 0);
		for series in all_series:
			indices = book_values('series_index', 'series:="' & series & '"', ',', 0);
			first = 1;
			lowest = 9999999;
			for index in indices:
				if first || index <# lowest then lowest = index; first = '' fi
			rof;
			vals = list_union(vals, series & ':' & lowest, ',')
		rof;
		set_globals(vals)
	fi;
	if $series && $series_index ==# select(vals, $series) then '1' fi#@#:b:yes"""

If you use the Advanced search dialog, the template is this:

program:
	vals = globals(vals='');
	if !vals then
		all_series = book_values('series', 'series:true', ',', 0);
		for series in all_series:
			indices = book_values('series_index', 'series:="' & series & '"', ',', 0);
			first = 1;
			lowest = 9999999;
			for index in indices:
				if first || index <# lowest then lowest = index; first = '' fi
			rof;
			vals = list_union(vals, series & ':' & lowest, ',')
		rof;
		set_globals(vals)
	fi;
	if $series && $series_index ==# select(vals, $series) then '1' fi

The template search dialog is this:


EDIT: if you store the above as a saved search then you can create a virtual library showing the lowest book.