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 A096916 Lesser prime factor of n-th product of two distinct primes. 13
 2, 2, 2, 3, 3, 2, 2, 3, 2, 5, 2, 3, 2, 3, 5, 3, 2, 2, 5, 3, 2, 7, 2, 5, 2, 3, 7, 3, 2, 5, 2, 3, 5, 2, 7, 2, 3, 3, 7, 2, 3, 2, 11, 5, 2, 5, 2, 3, 7, 2, 3, 2, 3, 5, 11, 2, 3, 2, 7, 5, 2, 11, 3, 2, 5, 7, 2, 3, 13, 2, 5, 3, 13, 3, 11, 2, 7, 2, 5, 3, 2, 2, 7, 3, 5, 2, 13, 7, 2, 3, 5, 3, 2, 11, 3, 17, 2, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n)*A070647(n) = A006881(n); a(n) < A070647(n); a(n) = A020639(A006881(n)). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 MATHEMATICA f[n_]:=Last/@FactorInteger[n]=={1, 1}; f1[n_]:=Min[First/@FactorInteger[n]]; f2[n_]:=Max[First/@FactorInteger[n]]; lst={}; Do[If[f[n], AppendTo[lst, f1[n]]], {n, 0, 6!}]; lst (* Vladimir Joseph Stephan Orlovsky, Apr 10 2010 *) PROG (Haskell) a096916 = a020639 . a006881 -- Reinhard Zumkeller, Sep 23 2011 (PARI) go(x)=my(v=List()); forprime(p=2, sqrtint(x\1), forprime(q=p+1, x\p, listput(v, [p*q, p]))); apply(v->v[2], vecsort(Vec(v), 1)) \\ Charles R Greathouse IV, Sep 14 2015 CROSSREFS Cf. A084126, A195758. Sequence in context: A124064 A348470 A317369 * A098014 A059957 A165924 Adjacent sequences: A096913 A096914 A096915 * A096917 A096918 A096919 KEYWORD nonn,look AUTHOR Reinhard Zumkeller, Jul 15 2004 STATUS approved

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Last modified February 8 21:33 EST 2023. Contains 360153 sequences. (Running on oeis4.)