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 A052485 Weak numbers (i.e., not powerful (1)): there is a prime p where p|n is true but p^2|n is not true. 14
 2, 3, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 82, 83, 84 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A112526(a(n)) = 0. - Reinhard Zumkeller, Sep 16 2011 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 FORMULA a(n) ~ n. - Charles R Greathouse IV, Jul 19 2012 MATHEMATICA Select[Range[1000], Min[FactorInteger[#][[All, 2]]] <= 1 &] (* Geoffrey Critzer, Feb 11 2015 *) PROG (Haskell) a052485 n = a052485_list !! (n-1) a052485_list = filter ((== 0) . a112526) [1..] -- Reinhard Zumkeller, Sep 16 2011 (PARI) is(n)=n>1 && vecmin(factor(n)[, 2])==1 \\ Charles R Greathouse IV, Mar 19 2014 (PARI) is(n)=!ispowerful(n) \\ Charles R Greathouse IV, Sep 18 2015 CROSSREFS Cf. A001694. Not the same as A007916. Sequence in context: A085971 A175082 A007916 * A109421 A212167 A317090 Adjacent sequences:  A052482 A052483 A052484 * A052486 A052487 A052488 KEYWORD nonn,easy AUTHOR Henry Bottomley, Mar 16 2000 STATUS approved

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Last modified March 19 15:02 EDT 2019. Contains 321330 sequences. (Running on oeis4.)