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You can get the set of positive integers with PositiveIntegers:
sage: PP = PositiveIntegers(); PP
Positive integers
sage: PP.cardinality()
+Infinity
sage: iter(PP).next()
1
In addition for any given range of integers, you can use the IntegerRange class to get an objects representing them. In fact, PositiveIntegers is just a specialized subclass of IntegerRange.
sage: NN1 = IntegerRange(1, oo); NN1
{1, 2, ..}
What types of operations are looking to do with this set?
