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 A104368 Number of distinct prime factors of A104365(n) = A104350(n) + 1. 8
 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 4, 4, 2, 1, 4, 2, 2, 3, 2, 1, 4, 3, 3, 1, 3, 4, 5, 4, 5, 4, 3, 3, 4, 7, 2, 5, 4, 4, 2, 4, 3, 4, 2, 3, 7, 4, 2, 4, 2, 3, 2, 4, 3, 4, 5, 3, 4, 4, 2, 1, 2, 4, 6, 4, 3, 3, 4, 4, 6, 6, 6, 5, 3, 6, 4, 5, 3, 3, 5, 3, 4, 3, 4, 7, 6, 4, 3, 4, 2, 3, 3, 2, 2, 5, 2, 3, 3, 6, 4, 3, 3, 2, 3, 2, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 LINKS Max Alekseyev, Table of n, a(n) for n = 1..158 (terms 142..151 from Tyler Busby) Reinhard Zumkeller, Products of largest prime factors of numbers <= n FORMULA a(n) = A001221(A104365(n)). MATHEMATICA A104350[n_] := Product[FactorInteger[k][[-1, 1]], {k, 1, n}]; PrimeNu[ Table[A104350[n] + 1, {n, 2, 50}]] (* G. C. Greubel, May 10 2017 *) CROSSREFS Cf. A001221, A054988, A066856, A104350, A104359, A104360, A104365, A104366, A104367, A104369, A104370, A104371, A104372. Sequence in context: A161108 A161043 A029316 * A218878 A364137 A240061 Adjacent sequences: A104365 A104366 A104367 * A104369 A104370 A104371 KEYWORD nonn AUTHOR Reinhard Zumkeller, Mar 06 2005 EXTENSIONS a(51)-a(76) from Amiram Eldar, Feb 12 2020 a(77)-a(81) from Jinyuan Wang, Apr 02 2020 Terms a(82) onward from Max Alekseyev, Oct 03 2022 STATUS approved

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Last modified September 14 13:32 EDT 2024. Contains 375921 sequences. (Running on oeis4.)