Three more terms are known, but are too large to show here. See A262555 for details. - N. J. A. Sloane, Oct 09 2015
Table of n, a(n) for n=1..2.
Cf. A089987, A262572, A262555.
See A262300 for more about this problem.
Sequence in context: A257375 A228033 A102910 * A181170 A243830 A002337
Adjacent sequences: A262295 A262296 A262297 * A262299 A262300 A262301
N. J. A. Sloane, Sep 25 2015