On Mon, Jan 23, 2012 at 8:03 PM, Dave Angel <d...@davea.name> wrote:
> On 01/23/2012 10:31 PM, Marc Tompkins wrote: > >> On Mon, Jan 23, 2012 at 12:08 PM, Shreesh bhat<shreeshbha...@gmail.com>** >> wrote: >> >> No,i meant sum of digits is prime and also sum of square of digits is >>> prime. >>> E.g: 23 is lucky cos >>> 2+3=>5 (prime) >>> 2**2+3**2 => 4+9 => 13 (prime) >>> >>> Thanks for the clarification - or I should say "correction", since "sum >> of >> square of digits" and "square of sum of digits" are NOT equivalent! >> >> But Shreesh' original wording was: > > > A number is called lucky if the sum of its digits, as well as the sum of > the squares of its digits is a prime number. How many numbers between A and > B are lucky? > > in a message 1/22/12 at 1:11, subject: "Re: [Tutor] Tutor Digest, Vol 95, > Issue 55" > > That thread soon got renamed to "OverflowError in lucky numbers script" > > Yes, but I - and apparently others - missed that thread; someone (Steven D'Aprano?) asked for a re-statement of the problem; the re-statement (which was the first time I'd seen the problem definition) was confusing. Sorry for starting a false trail; sorry for jumping in late.
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