A050646 a(n+1) is next smallest cube ending with a(n), initial term is 1.

1, 1331, 1003303631331, 1000000003003300003006603631003303631331

Offset: 1

Author

Patrick De Geest, Jul 15 1999

Keywords

• nonn
• base

Comments

a(5) contains 121 digits.

Crossrefs

Cf. A050647, A048563, A050640.

Formula

a(n) = A050647(n)^3.

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