A234605 a(n+1) is next smallest cube ending with a(n), initial term is 0.

0, 1000, 1331000, 1003303631331000, 1000000003003300003006603631003303631331000

Offset

1,2

Comments

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

Links

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

Formula

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

Mathematica

a[n_]:=(Sum[10^((3^i+1)/2), {i, 0, n-1}])^3; Array[a, 5, 0] (* Stefano Spezia, Mar 07 2025 *)

Crossrefs

Cf. A050646, A050647, A050648, A050650.

Sequence in context: A060365 A060366 A260692 * A013793 A013856 A111098

Adjacent sequences: A234602 A234603 A234604 * A234606 A234607 A234608

Keyword

nonn,base

Author

Derek Orr, Dec 28 2013

Status

approved