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 A009286 a(n) = lcm(sigma(n), phi(n)). 4
 1, 3, 4, 14, 12, 12, 24, 60, 78, 36, 60, 28, 84, 24, 24, 248, 144, 78, 180, 168, 96, 180, 264, 120, 620, 84, 360, 168, 420, 72, 480, 1008, 240, 432, 48, 1092, 684, 180, 168, 720, 840, 96, 924, 420, 312, 792, 1104, 496, 798, 1860, 288, 1176, 1404, 360, 360, 120, 720, 1260 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 Index entries for sequences related to lcm's FORMULA From Antti Karttunen, May 26 2017: (Start) a(n) = A062354(n) / A009223(n). a(A000040(n)) = A084921(n). - after Enrique Pérez Herrero's May 17 2012 comment in the latter sequence. (End) PROG (PARI) A009286(n) = lcm(sigma(n), eulerphi(n)); \\ Antti Karttunen, May 26 2017 CROSSREFS Cf. A000010, A000203, A009223, A062354, A084921. Sequence in context: A307893 A337297 A220846 * A076663 A277933 A278953 Adjacent sequences: A009283 A009284 A009285 * A009287 A009288 A009289 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified September 14 09:32 EDT 2024. Contains 375921 sequences. (Running on oeis4.)