Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #14 Dec 04 2017 02:55:01
%S 1,0,1,3,16,162,2004,29676,511660,10077696,223416176,5508996067,
%T 149620408779,4439426853025,142915981606747,4962277770372786,
%U 184884258895036416,7358499526831141011,311624392527600238320,13992684008957401915051,664101403687644955591709
%N a(n) = ceiling((n - sqrt(n))^n).
%C Suggested by the discovery of Boris Alexeev in the year 2004 that a(6) = 2004.
%H Robert Israel, <a href="/A091146/b091146.txt">Table of n, a(n) for n = 0..389</a>
%p f:= n -> ceil((n-sqrt(n))^n):
%p map(f, [$0..40]); # _Robert Israel_, Dec 03 2017
%t Join[{1},Table[Ceiling[(n-Sqrt[n])^n],{n,20}]] (* _Harvey P. Dale_, Jun 19 2016 *)
%o (PARI) a(n) = ceil((n - sqrt(n))^n); \\ _Altug Alkan_, Dec 04 2017
%K nonn
%O 0,4
%A _N. J. A. Sloane_, Feb 23 2004