Hello, I thought I'd try Sage for a casual computation. I was interested in which numbers of the form (2^n - (-1)^n)/3 are prime. I first tried out n=23:
sage: (2^23+1)/3 2796203 sage: _.is_prime() False sage: factor(2796203) 2796203 It turns out that Rational.is_prime does not exist and the fallback gives false answers. Then, I tried to print a list of primes of the above form, using the global is_prime: sage: for n in range(1,100): ....: if is_prime((2^n - (-1)^n)/3): ....: print((2^n - (-1)^n)/3) ....: sage: No output. Turns out `is_prime(ZZ((2^n - (-1)^n)/3))` works. Really? How long does Sage exist without a fix to that? This goes beyond "serious lack of reviewers" and "dev shortage". There was always the notion that you shouldn't "team up" for ticket review. I'm now breaking it. If YOU are interested in fixing the above or similar problems please mail me. There are also about 25 calculus tickets from me waiting for review. But probably noone is really interested in that either. The algebraists can have their Sage back. Good job. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
