A247839 Smallest Brady number with n digits.

2308, 10830, 119485, 1325165, 14696300, 100729939, 1117112142, 12388963501, 137395710653, 1523741780684, 10443881535043, 115824421096014, 1284512513591197, 14245462070599181, 157984595290182188, 1082842525215598387, 12008907626959811406, 133180826421773523853

Offset: 4

Author

Tim Duffy, Sep 24 2014

Keywords

• nonn
• base
• easy

Comments

If n > 4, 1 < a(n)/10^(n-1) < phi. Successive records are at n = 5, 6, 7, 8, 13, 18, 32, 46, 60, 74, 181, 14807, 29433, 44059, 58685, 1223375, .... - Charles R Greathouse IV, Jan 20 2016

Links

• Brady Haran and Matt Parker, Brady Numbers, Numberphile video (2014)

Crossrefs

Cf. A247698.

Programs

PARI

A247698(n)=([1,1;1,0]^n*[1953;355])[1,1]
a(n)=if(n<5,return(2308)); my(k=log(10^n/15720)\log((1+sqrt(5))/2),t); while(#Str(t=A247698(k))Charles R Greathouse IV, Jan 20 2016