1,2

a(6) is too large to include (contains 124 digits).

Table of n, a(n) for n=1..5.

For n>1, a(n) = 1000*A050646(n-1) = 1000*A050647(n-1)^3.

a(n) = (sum_{i=0..n-1} 10^((3^i+1)/2))^3. - Max Alekseyev, Jan 07 2015

Cf. A050650, A050648.

Sequence in context: A060365 A060366 A260692 * A013793 A013856 A111098

Adjacent sequences: A234602 A234603 A234604 * A234606 A234607 A234608

nonn,base

Derek Orr, Dec 28 2013

approved