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 A067068 a(n) = n* - 2^n, where n* (A003418) = least common multiple of the numbers [1,...,n]. 2
 -1, -2, -2, -4, 28, -4, 292, 584, 2008, 1496, 25672, 23624, 352168, 343976, 327592, 655184, 12121168, 11990096, 232268272, 231743984, 230695408, 228598256, 5345840272, 5337451664, 26737589968, 26704035536, 80179215472, 80044997744 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS It is known that this sequence is nonnegative for n >= 7. This can be established using the methods used to show A059794 is nonnegative. - Carl Pomerance, Bell Labs, Feb 16 2002 REFERENCES Tenenbaum, G. (2015). Introduction to analytic and probabilistic number theory, 3rd ed., American Mathematical Soc. See Theorem 1.5. LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA Table[LCM@@Range[n]-2^n, {n, 30}] (* Harvey P. Dale, Sep 24 2022 *) CROSSREFS Cf. A003418, A059794. Sequence in context: A189879 A189870 A257614 * A290126 A266046 A032334 Adjacent sequences: A067065 A067066 A067067 * A067069 A067070 A067071 KEYWORD sign AUTHOR N. J. A. Sloane, Feb 17 2002 STATUS approved

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Last modified March 27 05:46 EDT 2023. Contains 361554 sequences. (Running on oeis4.)