I was thinking the same thing until I looked at Perl, which has 4 being quite frequent.
The reason, of course, is that 4 is also $, which is used to denote a scalar in Perl.
Thus, because 5,6,7 correspond to %,^,&, which generally get used to a lesser degree for things like modulo, hashes, exponentiation and logical-and, they're used less.
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I was thinking the same thing until I looked at Perl, which has 4 being quite frequent.
The reason, of course, is that 4 is also $, which is used to denote a scalar in Perl.
Thus, because 5,6,7 correspond to %,^,&, which generally get used to a lesser degree for things like modulo, hashes, exponentiation and logical-and, they're used less.