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 A345375 Number of unitary prime divisors of n whose prime index is even. 0
 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 2, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 2, 0, 0, 2, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 2, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 2, 1, 0, 0, 0, 0, 2, 0, 1, 2, 0, 1, 0, 2, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,21 LINKS Table of n, a(n) for n=1..93. FORMULA a(n) = Sum_{p|n, p prime} ((pi(p)+1) mod 2) * floor(1/gcd(p,n/p)). CROSSREFS Cf. A056169. Sequence in context: A025462 A024879 A024316 * A101669 A243067 A086965 Adjacent sequences: A345372 A345373 A345374 * A345376 A345377 A345378 KEYWORD nonn AUTHOR Wesley Ivan Hurt, Jun 16 2021 STATUS approved

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Last modified September 23 12:57 EDT 2023. Contains 365551 sequences. (Running on oeis4.)