A132913 a(n) = ceiling(sqrt(n) + n^(1/3)).

2, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13

Offset: 1

Author

Mohammad K. Azarian, Nov 18 2007

Keywords

• nonn

Crossrefs

Cf. A000196, A003059, A134914, A134915, A134916.

Programs

Mathematica

Table[Ceiling[Sqrt[n]+Surd[n,3]],{n,70}] (* Harvey P. Dale, Jul 31 2018 *)