note TimToady Well, but the conversion costs something. So in Perl 6, if you're worried about efficiency, you'd probably write it like this: <code> 1,11,111,1111 ... { $^prev * 10 + 1 } </code> Unless we can make the "whatever" version intuit such an algebraic relationship, in which case it would just be: <code> 1,11,111,111 ... * </code> Just how far we could/should drive the intuition of the series operator is an interesting question. 716367 716665