#20932: Incorrect generation of p1list in modular symbols
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Reporter: kedlaya | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: modular forms | Resolution:
Keywords: modular symbols | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by kedlaya):
In `p1list`, one finds different code depending on the size of the level.
For levels in this range, the relevant subroutine is `p1list_llong`, which
contains:
{{{
cmax = N/2
if N%2: # N odd, max divisor is <= N/3
if N%5: # N not a multiple of 3 either, max is N/5
cmax = N/5
else:
cmax = N/3
}}}
but `N%5` should be `N%3`.
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Ticket URL: <https://trac.sagemath.org/ticket/20932#comment:1>
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