Lucas Numbers (Custom Type)
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subset NonNegativeInt of Int where * >= 0;
sub lucas(NonNegativeInt $nth) returns NonNegativeInt {
given $nth {
when 0 { 2 }
when 1 { 1 }
default { lucas($nth - 1) + lucas($nth - 2) }
}
}
say lucas(8);
Raku
INFO