Multiplicatively perfect numbers: Difference between revisions
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For the stretch goal, we need to determine the number of semi-primes, given the number of multiplicatively perfect numbers less than N:
<syntaxhighlight lang=J>adjSemiPrime=: + _1 + %: -&(p:inv) 3&%:</syntaxhighlight>
Thus (first number in following results is count of multiplicatively perfect numbers, second is count of semiprimes):
<syntaxhighlight lang=J> {{ (,
150 153
{{ (,
1354 1365
{{ (,
12074 12110
{{ (,
108223 108326</syntaxhighlight>
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