1,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
Cf. A005184, A068529.
Sequence in context: A170864 A089619 A094473 * A088315 A138296 A094474
Adjacent sequences: A068527 A068528 A068529 * A068531 A068532 A068533
more,nonn
Naohiro Nomoto (n_nomoto(AT)yabumi.com), Mar 22 2002