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 A280726 a(n) = A049501(phi(n)). 6
 0, 0, 1, 1, 1, 1, 2, 1, 2, 1, 4, 1, 2, 2, 1, 1, 1, 2, 5, 1, 2, 4, 5, 1, 4, 2, 5, 2, 3, 1, 4, 1, 4, 1, 2, 2, 5, 5, 2, 1, 4, 2, 9, 4, 2, 5, 6, 1, 9, 4, 1, 2, 6, 5, 4, 2, 5, 3, 8, 1, 4, 4, 5, 1, 2, 4, 7, 1, 5, 2, 7, 2, 5, 5, 4, 5, 4, 2, 7, 1, 7, 4, 10, 2, 1, 9, 3, 4, 5, 2, 5, 5, 4, 6, 5, 1, 2, 9, 4, 4, 7, 1, 8, 2, 2, 6, 12, 5, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS a(n) = Major index (1st definition) of the total numbers <=n and prime to n i.e., phi(n). LINKS Indranil Ghosh, Table of n, a(n) for n = 1..10000 Indranil Ghosh, Python Program to generate the sequence FORMULA a(n) = A049501(A000010(n)). EXAMPLE For n = 10, phi(n) = 4 and major index (1st definition) of 4 = 1. So a(n) = 1. CROSSREFS Cf. A000010, A049501, A280306, A280531. Sequence in context: A333570 A363320 A351032 * A256607 A256608 A279186 Adjacent sequences: A280723 A280724 A280725 * A280727 A280728 A280729 KEYWORD nonn AUTHOR Indranil Ghosh, Jan 07 2017 STATUS approved

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Last modified February 29 09:21 EST 2024. Contains 370418 sequences. (Running on oeis4.)