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A258570 Smallest prime factors of 5-full numbers. 6

%I #4 Jun 06 2015 17:24:52

%S 1,2,2,2,3,2,2,3,2,2,3,5,2,3,2,2,2,5,2,7,3,2,2,2,2,3,2,2,2,5,2,2,7,2,

%T 2,2,11,3,2,2,2,2,2,2,13,2,5,2,2,2,2,2,3,2,2,2,2,3,2,7,2,2,2,2,2,2,2,

%U 17,2,3,2,2,11,2,5,2,2,2,2,2,3,19,2,2,2

%N Smallest prime factors of 5-full numbers.

%C a(n) = A020639(A069492(n));

%C a(A258602(n)) = A000040(n) and a(m) != A000040(n) for m < A258602(n).

%H Reinhard Zumkeller, <a href="/A258570/b258570.txt">Table of n, a(n) for n = 1..10000</a>

%o (Haskell)

%o a258570 = a020639 . a069492

%Y Cf. A069492, A020639, A258602, A258567, A258568, A258569, A258571.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Jun 06 2015

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Last modified April 23 19:56 EDT 2024. Contains 371916 sequences. (Running on oeis4.)