kamocyc

=LAMBDA(f,LAMBDA(x,f(LAMBDA(v,x(x)(v))))(LAMBDA(x,f(LAMBDA(v,x(x)(v))))))(LAMBDA(fact,LAMBDA(x,IF(x=0,1,x*fact(x-1)))))(5)

kamocyc

// `is_prime` function
=LAMBDA(n, OR(n = 2, AND(n >= 2, SUM((MOD(n,SEQUENCE(SQRT(n),1,2))=0)+0) = 0)))

// `main` function
=LAMBDA(
    current_number,
    remaining_nth,
    IF(is_prime(current_number),
        IF(remaining_nth = 1,
            current_number,

kamocyc

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