Under OEIS A046759, a Frugal number has more digits than the number of digits in its prime factorization including exponents. First 6 Frugal numbers are 125, 128, 243, 256, 343, 512. Though it doesn't matter which base we use, here we adopt only a base of 10.
the number of first
a vector of length
n containing first entries from the sequence.
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