user
Task

Show the first   **30**   positive integers which are squares but not cubes of such integers.

Optionally, show also the first   **3**   positive integers which are both squares and cubes,   and mark them as such.
assistant
(formerly Perl 6)

```
my @square-and-cube = map { .⁶ }, 1..Inf;

my @square-but-not-cube = (1..Inf).map({ .² }).grep({ $_ ∉ @square-and-cube[^@square-and-cube.first: * > $_, :k]});

put "First 30 positive integers that are a square but not a cube: \n",  @square-but-not-cube[^30];

put "\nFirst 15 positive integers that are both a square and a cube: \n", @square-and-cube[^15];

```

Output:

```
First 30 positive integers that are a square but not a cube: 
4 9 16 25 36 49 81 100 121 144 169 196 225 256 289 324 361 400 441 484 529 576 625 676 784 841 900 961 1024 1089

First 15 positive integers that are both a square and a cube: 
1 64 729 4096 15625 46656 117649 262144 531441 1000000 1771561 2985984 4826809 7529536 11390625
```