1,1

J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 184, pp 57, Ellipses, Paris 2008.

a(n)=A007774(10^n).

Cf. A007774.

Sequence in context: A052761 A073993 A052758 this_sequence A128960 A047057 A066406

Adjacent sequences: A143037 A143038 A143039 this_sequence A143041 A143042 A143043

more,nonn

Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 18 2008