3,2
It seems that a(9)=137 and a(n) = A007678(n) for all even n.
Vladimir Letsko, Mathematical Marathon at dxdy
Vladimir letsko, Mathematical Marathon fn vspu
A006522, A007678
Sequence in context: A006527 A057304 A001752 this_sequence A143075 A007678 A159350
Adjacent sequences: A160857 A160858 A160859 this_sequence A160861 A160862 A160863
hard,more,nonn
Vladimir Letsko (val-etc(AT)yandex.ru), May 29 2009, May 30 2009
Search completed in 0.002 seconds