On Mon, Feb 23, 2009 at 1:29 AM, Fabian Seoane <[email protected]> wrote: > > > On Mon, Feb 23, 2009 at 10:16 AM, Fabian Seoane <[email protected]> > wrote: >> >> currently SymPy has a rather confusing behaviour: >> >> In [1]: isprime(1) >> Out[1]: False >> >> In [2]: Integer(1).is_prime >> Out[2]: True >> >> I'd be glad to fix this, but ... which one is correct? > > responding to myself, I think 1 should not be considered prime, since prime > numbers are defined for n>=2 (as isprime from sympy.ntheory correctly says), > so Integer(1).is_prime is wrong
Yeah, Sage also returns False for 1: sage: 1.is_prime() False sage: 2.is_prime() True Ondrej --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
