1,3

For n = 1, a(1) = 1, one solution: {x_1} = {1}.

For n = 2, a(2) = 1, one solution: {x_1, x_2} = {2, 3}.

For n = 3, a(3) = 5, five solutions: {x_1, x_2, x_3} = {3, 4, 5}, {3, 3, 8}, {2, 4, 15}, {2, 5, 9}, {2, 6, 7}.

Adjacent sequences: A085095 A085096 A085097 this_sequence A085099 A085100 A085101

Sequence in context: A052895 A005989 A114604 this_sequence A118085 A099794 A079646

nonn,more

DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Aug 10 2003