1,1

Phi of {7, 13, 35, 65, 97, 193, 485, 769} is {6, 12, 24, 48, 192, 384, 768}, of which {2, 4, 8, 16, 32, 64, 128, 256} are the largest even factors.

Cf. A000010, A066669-A066672.

Sequence in context: A001001 A067692 A117706 this_sequence A155036 A088985 A022005

Adjacent sequences: A066670 A066671 A066672 this_sequence A066674 A066675 A066676

nonn

Labos E. (labos(AT)ana.sote.hu), Dec 18 2001