Nice primes: Difference between revisions
Added Raku
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33 nice primes found: {509,547,563,569,587,"...",941,947,977,983,997}
</pre>
=={{header|Raku}}==
<lang perl6>sub digroot ($r) { .tail given $r, { [+] .comb } ... { .chars == 1 } }
my @is-nice = lazy (0..*).map: { .&is-prime && .&digroot.&is-prime ?? $_ !! False };
say @is-nice1[500 ^..^ 1000].grep(*.so).batch(11)».fmt("%4d").join: "\n";</lang>
{{out}}
<pre> 509 547 563 569 587 599 601 617 619 641 653
659 673 677 691 709 727 743 761 797 821 839
853 857 887 907 911 929 941 947 977 983 997</pre>
=={{header|REXX}}==
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