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There are 31 three digit triangular numbers
There are 307 five digit triangular numbers
Elapsed time: 0.02 0 0 0
#!/usr/bin/perl -w # -*-Perl-*-
my @tim = times();
print "Elapsed time:\t",join "\t", @tim,"\n";
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
Results (210 votes),