experimental-projects/oeis-research/Daniel Suteu/Other programs/prime_count_is_pi.sf

#!/usr/bin/ruby

for n in (1..300) {
    var sum = 0
    for m in (1 .. n) {
        var k = n
        for f in (m.factor.reverse) {
            k.remove!(f)
        }
        #sum += k
        #say k
        if (k.is_prime) {
            sum += 1;
        }
    }

    if (sum == n.prime_count) {
        #say sum
        say n
    }
}


__END__
1
2
3
6
15
20
21
63
265
295
875
978