A135671 a(n) = ceiling(n - n^(2/3)).

0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 7, 7, 8, 9, 9, 10, 11, 12, 12, 13, 14, 15, 15, 16, 17, 18, 18, 19, 20, 21, 22, 22, 23, 24, 25, 26, 26, 27, 28, 29, 30, 30, 31, 32, 33, 34, 34, 35, 36, 37, 38, 39, 39, 40, 41, 42, 43, 44, 44, 45, 46

Offset: 1

Author

Mohammad K. Azarian, Nov 25 2007

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A135660, A135661, A135662, A135663, A135664, A135665, A028391, A135668, A135669, A135670.

Programs

Magma

[Ceiling(n - n^(2/3)): n in [1..100]]; // Vincenzo Librandi, Feb 16 2013

Mathematica

Table[Ceiling[n - n^(2/3)], {n, 100}] (* Vincenzo Librandi, Feb 16 2013 *)

PARI

a(n)=n-sqrtnint(n^2,3) \\ Charles R Greathouse IV, Sep 02 2015

Extensions

Offset corrected by Mohammad K. Azarian, Nov 19 2008