OFFSET
4,1
COMMENTS
If a(n) = A247698(k), then a(n+1) = A247698(k+4) or a(n+1) = A247698(k+5). - Charles R Greathouse IV, Dec 10 2019
LINKS
Brady Haran and Matt Parker, Brady Numbers, Numberphile video (2014).
MATHEMATICA
b[1] = 2308; b[2] = 4261; b[n_] := b[n] = b[n-1] + b[n-2]; a[n_] := Block[ {k=1}, While[ IntegerLength[b@k] <= n, k++]; b[k-1]]; a /@ Range[4, 21] (* Giovanni Resta, Sep 24 2018 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Joshua Oliver, Sep 24 2018
STATUS
approved