#13516: prime_powers doesn't work with start very well
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Reporter: kcrisman | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-5.4
Component: number theory | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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See [https://groups.google.com/forum/?fromgroups=#!topic/sage-
support/lW_a7ZE3Zf8 this sage-support thread].
{{{
In Sage 5.3, the function prime_powers behaves a little strange:
sage: prime_powers(4,10)
[4, 5, 7, 8, 9]
# As expected
sage: prime_powers(5,10)
[7, 8, 9]
# 5 isn't a prime power anymore???
# And now things become even worse:
sage: prime_powers(7,10)
---------------------------------------------------------------------------
IndexError Traceback (most recent call
last)
/home/mueller/<ipython console> in <module>()
/home/mueller/local/sage-5.3/local/lib/python2.7/site-
packages/sage/rings/arith.pyc in prime_powers(start, stop)
743 i = bisect(v, start)
744 if start > 2:
--> 745 if v[i] == start:
746 i -= 1
747 w = list(v[i:])
IndexError: list index out of range
}}}
Yeah, this seems problematic. The code in question is ''old'', too, so
perhaps there is a more efficient way to do it in the meantime...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13516>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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