A319604 Largest Brady number with n digits.

6569, 73857, 818996, 9082813, 62254526, 690413273, 7656800529, 84915219092, 941724210541, 6454673763134, 71583428964617, 793872392373921, 8804179745077748, 97639849588229149, 669233485047004862, 7421913081219006521, 82310277378456076593, 912834964244235849044

Offset: 4

Author

Joshua Oliver, Sep 24 2018

Keywords

• nonn
• base
• easy

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).

Crossrefs

Cf. A247698, A247839.

Programs

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 *)