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A096918 Intermediate prime-factor of n-th product of 3 distinct primes. 7
3, 3, 3, 5, 3, 3, 5, 5, 3, 5, 3, 7, 5, 5, 3, 7, 3, 5, 5, 3, 5, 7, 7, 3, 5, 3, 7, 7, 3, 5, 11, 5, 5, 3, 7, 5, 3, 7, 3, 5, 11, 7, 7, 3, 7, 5, 11, 3, 11, 5, 7, 5, 3, 13, 7, 5, 5, 3, 7, 13, 3, 11, 7, 5, 3, 5, 11, 7, 3, 5, 7, 13, 7, 3, 7, 5, 5, 3, 11, 11, 3, 5, 17, 7, 3, 7, 13, 7, 5, 3, 11, 5, 5, 11, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A096917(n)*a(n)*A096919(n)=A007304(n); A096917(n)<a(n) < A096919(n).

LINKS

Table of n, a(n) for n=1..95.

MATHEMATICA

f[n_]:=Last/@FactorInteger[n]=={1, 1, 1}; f1[n_]:=Min[First/@FactorInteger[n]]; f2[n_]:=Max[First/@FactorInteger[n]]; f3[n_]:=First/@FactorInteger[n][[2, 1]]; lst={}; Do[If[f[n], AppendTo[lst, f3[n]]], {n, 0, 7!}]; lst [From Vladimir Joseph Stephan Orlovsky, Apr 10 2010]

CROSSREFS

Sequence in context: A236569 A103153 A162022 * A075018 A125958 A132448

Adjacent sequences:  A096915 A096916 A096917 * A096919 A096920 A096921

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 15 2004

STATUS

approved

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Last modified November 23 04:43 EST 2014. Contains 249839 sequences.