1,2

This sequence is well-defined.

Table of n, a(n) for n=1..82.

Romanian Master in Mathematics Contest, Bucharest, 2007, Problem 3

Cf. A129795, A138255, A138256, A138257, A138259, A138260, A138261, A138262, A138263.

Sequence in context: A198199 A124369 A205013 * A205599 A265671 A214707

Adjacent sequences: A138255 A138256 A138257 * A138259 A138260 A138261

nonn

Max Alekseyev, Mar 09 2008.

approved