OFFSET
1,1
COMMENTS
The next term has 110 digits. - Harvey P. Dale, May 15 2018
MATHEMATICA
NestList[FromDigits[IntegerDigits[#, 2]]&, 12, 4] (* Harvey P. Dale, May 15 2018 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Jul 14 2015
STATUS
approved