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No other terms below 10^10.
Table of n, a(n) for n=1..20.
Cf. A087666, A086336.
Sequence in context: A101647 A155150 A078745 * A112813 A048018 A047197
Adjacent sequences: A087660 A087661 A087662 * A087664 A087665 A087666
N. J. A. Sloane, Sep 27 2003
More terms from Robert G. Wilson v, Oct 10 2003
a(11) from N. J. A. Sloane, Oct 16 2003
More terms from Robert G. Wilson v, Mar 11 2004
a(17)-a(20) from Max Alekseyev, Jul 29 2011