Pan base non-primes: Difference between revisions
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'''"4"''' is ''not'' a prime in every base except bases 2, 3, and 4 where it is an invalid number (and hence not a prime there either.)
In general, even pan-base non-primes are much more prevalent than odd, though both are fairly common.
With the exception of '''"10"''', numeric strings that end in 0 are composite in every base where they are valid.
Numeric strings where the greatest common divisor of all of the digits is more than 1 are composite in every base.
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put "First 50 pan-base non-primes:\n" ~ @np[^50].batch(10)».fmt("%3s").join: "\n";
put "\nFirst 20 odd pan-base non-primes:\n" ~ @np.grep(
my $threshold = 2500;
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