1,2

Cf. A050646, A048564, A050641.

Sequence in context: A080050 A067254 A099806 this_sequence A082265 A161761 A114754

Adjacent sequences: A050644 A050645 A050646 this_sequence A050648 A050649 A050650

nonn,base

Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1999.

Jun 11, 2001: Frank Ellermann conjectures that if b(n) = 10^(3^n -1), i.e. 1, 100, 100000000, etc. then a(n) = concatenation b( n-2 ) || a( n-1 ) for n > 1.

More terms from UlrSchimke(AT)aol.com, Nov 06, 2001, who remarks that a(6) = 10^121+a(5) = concat (10^80, a(5)) and a(7) = 10^364+a(6) = concat (10^242, a(6)), which supports Ellermann's conjecture.