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A096067 Number of 3-smooth numbers between successive numbers that are powers of 2 or of 3. 0
0, 0, 0, 1, 0, 1, 2, 0, 3, 1, 2, 4, 0, 5, 2, 3, 6, 0, 6, 5, 2, 8, 2, 6, 8, 1, 10, 4, 6, 11, 0, 11, 8, 4, 13, 3, 10, 12, 2, 15, 6, 9, 16, 0, 17, 9, 8, 18, 2 (list; graph; refs; listen; history; internal format)
OFFSET

1,7

COMMENTS

a(n) = {k: A006899(n) < A003586(k) < A006899(n+1)}.

EXAMPLE

n=16: three 3-smooth numbers between A006899(16)=3^6=729 and

A006899(17)=2^10=1024: A003586(38)=2^8*3=768, A003586(39)=2^5*3^3=864 and A003586(40)=2^2*3^5=972, therefore a(16)=3.

CROSSREFS

Sequence in context: A068915 A133925 A071492 * A098861 A177878 A125940

Adjacent sequences:  A096064 A096065 A096066 * A096068 A096069 A096070

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 21 2004

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Last modified February 16 11:51 EST 2012. Contains 205908 sequences.