OFFSET
1,1
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 184, pp 57, Ellipses, Paris 2008.
FORMULA
a(n)=A007774(10^n).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Lekraj Beedassy, Jul 18 2008
EXTENSIONS
a(8)-a(10) from Donovan Johnson, Mar 26 2010
a(11) from Max Alekseyev, Mar 17 2023
STATUS
approved