Piprimes
my @pi = (1..*).map: { state $pi = 0; $pi += .is-prime };
say @pi[^(@pi.first: * >= 22, :k)].batch(10)».fmt('%2d').join: "\n";
Output:
0 1 2 2 3 3 4 4 4 4
5 5 6 6 6 6 7 7 8 8
8 8 9 9 9 9 9 9 10 10
11 11 11 11 11 11 12 12 12 12
13 13 14 14 14 14 15 15 15 15
15 15 16 16 16 16 16 16 17 17
18 18 18 18 18 18 19 19 19 19
20 20 21 21 21 21 21 21
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