Under OEIS A001694, a Powerful number is a positive integer such that for every prime p dividing the number, p^2 also divides the number. First 6 powerful numbers are 1, 4, 8, 9, 16, 25.
Powerful(n, gmp = TRUE)
the number of first
a vector of length
n containing first entries from the sequence.
## generate first 20 Powerful numbers print(Powerful(20))
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