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A017966
Powers of sqrt(20) rounded up.
1
1, 5, 20, 90, 400, 1789, 8000, 35778, 160000, 715542, 3200000, 14310836, 64000000, 286216702, 1280000000, 5724334023, 25600000000, 114486680448, 512000000000, 2289733608960, 10240000000000, 45794672179196
OFFSET
0,2
LINKS
MATHEMATICA
Ceiling[(Sqrt[20])^Range[0, 40]] (* Vincenzo Librandi, Nov 21 2011 *)
PROG
(Magma) [Ceiling(Sqrt(20^n)): n in [0..30]]; // Vincenzo Librandi, Nov 21 2011
CROSSREFS
Sequence in context: A271096 A269716 A192249 * A360076 A365115 A375455
KEYWORD
nonn
STATUS
approved