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 A174898 a(n) = characteristic function of numbers k such that A007955(m) = k has no solution for any m, where A007955(m) = product of divisors of m. 4
 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) = characteristic function of numbers from A174896(n). a(n) = 1 if A007955(m) not equal to n for any m, else 0. LINKS Antti Karttunen, Table of n, a(n) for n = 1..20000 (computed from the b-file of A174897) FORMULA a(n) = 1 - A174897(n). CROSSREFS Cf. A007955, A174896, A174897. Sequence in context: A288377 A341609 A064911 * A099618 A324883 A106002 Adjacent sequences:  A174895 A174896 A174897 * A174899 A174900 A174901 KEYWORD nonn AUTHOR Jaroslav Krizek, Apr 01 2010 EXTENSIONS More terms from Antti Karttunen, Oct 20 2017 STATUS approved

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Last modified January 16 13:57 EST 2022. Contains 350376 sequences. (Running on oeis4.)