1,7

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

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.

Sequence in context: A068915 A133925 A071492 this_sequence A098861 A125940 A071504

Adjacent sequences: A096064 A096065 A096066 this_sequence A096068 A096069 A096070

nonn

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