A121857 a(n) = ceiling(e*sqrt(n)).

0, 3, 4, 5, 6, 7, 7, 8, 8, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 24

Offset: 0

Author

Mohammad K. Azarian, Aug 30 2006

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000 (indices changed and term 1000 added by Ivan Panchenko)

Programs

Mathematica

Table[Ceiling[E Sqrt[n]], {n, 0, 80}] (* Vincenzo Librandi, Feb 21 2013 *)

Extensions

Offset corrected by Ivan Panchenko, Nov 13 2013