OFFSET
2,1
FORMULA
a(n) = ceiling(sqrt(5*10^n)), n > 1.
MATHEMATICA
Table[Ceiling @ Sqrt[5 * 10^n], {n, 2 , 24}] (* Amiram Eldar, Oct 08 2019 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Nov 15 1998
STATUS
approved