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URL: https://oeis.org/A212178

⇱ A212178 - OEIS

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A212178
Number of exponents >= 2 in canonical prime factorization of A025487(n) (first integer of each prime signature).
2
0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 2, 1, 0, 2, 1, 1, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 3, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 3, 1, 1, 2, 2, 0, 2, 2, 2, 1, 1, 2, 3, 1, 1, 2, 2, 1, 2, 2, 3, 2, 1, 3, 2, 1, 2, 3, 2, 1, 2, 1, 2, 2, 1, 2, 2, 3, 2, 1
OFFSET
1,11
COMMENTS
Length of row n of A212175 equals a(n) if a(n) is positive, 1 otherwise.
FORMULA
a(n) = A056170(A025487(n)).
EXAMPLE
The canonical prime factorization of 24 (2^3*3) has 1 exponent that equals or exceeds 2. Since 24 = A025487(8), a(8) = 1.
CROSSREFS
Sequence in context: A161098 A354999 A136177 * A322818 A382857 A392065
KEYWORD
nonn
AUTHOR
Matthew Vandermast, Jun 04 2012
STATUS
approved