%I #14 Jul 08 2025 06:28:45

%S 1,2,3,4,7,10,16,26,40,64,100,159,252,399,631,1000,1585,2512,3982,

%T 6310,10000,15849,25119,39811,63096,100000,158490,251189,398108,

%U 630958,1000000,1584894,2511887,3981072,6309574

%N Powers of fifth root of 10 rounded up.

%t Ceiling[Surd[10,5]^Range[0,40]] (* _Harvey P. Dale_, Dec 30 2017 *)

%o (PARI) a(n) = sqrtnint(10^n-1, 5) + 1; \\ _Michel Marcus_, Jun 26 2024

%Y Cf. A018141, A018142.

%K nonn

%O 0,2

%A _N. J. A. Sloane_