1,1

Up to n=200, A007408(n) behaves roughly like 10^(1.3 n) and there are only 14 points (for n < 200) such that A007408(n) >= A007408(n+1); they are all such that A007408(n)>A007408(n+1)<A007408(n+2).

a(1) = 5 since k=5 is the smallest index such that A007408(k)>=A007408(k+1).

select(n->A007408(n)>=A007408(n+1), [$1..200]);

Cf. A007408.

Sequence in context: A019373 A140568 A019349 this_sequence A129745 A038964 A019401

Adjacent sequences: A124870 A124871 A124872 this_sequence A124874 A124875 A124876

hard,more,nonn

M. F. Hasler (Maximilian.Hasler(AT)gmail.com), Nov 11 2006