1,2

Table of n, a(n) for n=1..71.

Wikipedia, Commutative hyperoperations

a(2) = 2 because 2^(log 2) = 1.616806672241674663299273071... and this rounds to 2 as an integer.

A245473:=n->round(2^log(n)); seq(A245473(n), n=1..50); # Wesley Ivan Hurt, Jul 24 2014

Table[Round[2^Log[n]], {n, 50}] (* Wesley Ivan Hurt, Jul 24 2014 *)

(PARI) a(n) = round(2^log(n)); \\ Michel Marcus, Jul 23 2014

Sequence in context: A163127 A077113 A143796 * A306904 A057362 A214046

Adjacent sequences: A245470 A245471 A245472 * A245474 A245475 A245476

nonn

J. Lowell, Jul 23 2014

More terms from Michel Marcus, Jul 23 2014

approved