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a(n) = floor( n^Pi ).
2

%I #12 Jan 10 2015 10:30:35

%S 1,8,31,77,156,278,451,687,995,1385,1869,2456,3159,3987,4952,6065,

%T 7337,8781,10406,12226,14251,16494,18966,21680,24646,27878,31387,

%U 35186,39287,43703,48445,53526,58959,64756,70930,77494,84459,91840,99649

%N a(n) = floor( n^Pi ).

%e a(5) = floor(5^Pi) = floor(156.992545308865907578459198832649...) = 156.

%p for n from 1 to 50 do printf("%d,",floor(n^Pi)) od;

%t a[n_]:=Floor[n^Pi]; (* _Vladimir Joseph Stephan Orlovsky_, Dec 12 2008 *)

%t Array[Floor[#^Pi]&,40] (* _Harvey P. Dale_, Aug 29 2012 *)

%Y Cf. A001672.

%K nonn,easy

%O 1,2

%A _Amarnath Murthy_, Apr 26 2001

%E More terms from Winston C. Yang (winston(AT)cs.wisc.edu), May 19 2001