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 A369058 a(n) = 1 if n is a product of three (not necessarily distinct) odd primes, otherwise 0. 5
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1 LINKS Antti Karttunen, Table of n, a(n) for n = 1..100000 Index entries for characteristic functions FORMULA a(n) = A000035(n) * A101605(n). EXAMPLE a(27) = 1 because 27 = 3*3*3. a(45) = 1 because 45 = 3*3*5. PROG (PARI) A369058(n) = ((n%2)&&(3==bigomega(n))); CROSSREFS Characteristic function of A046316. Cf. A000035, A001222, A101605. Sequence in context: A011743 A011742 A011741 * A277165 A011740 A354344 Adjacent sequences: A369055 A369056 A369057 * A369059 A369060 A369061 KEYWORD nonn AUTHOR Antti Karttunen, Jan 20 2024 STATUS approved

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Last modified July 19 19:31 EDT 2024. Contains 374436 sequences. (Running on oeis4.)