A018859 - OEIS

%I #16 Jan 29 2017 08:53:10

%S 1,256,302231454903657293676544,4,5070602400912917605986812821504,64,

%T 70368744177664,81129638414606681695789005144064,

%U 91343852333181432387730302044767688728495783936,1024,1125899906842624

%N Smallest power of 4 that begins with n.

%H Seiichi Manyama, <a href="/A018859/b018859.txt">Table of n, a(n) for n = 1..490</a>

%F a(n) = 4^A018860(n). - _Michel Marcus_, Feb 24 2016

%F a(4^n) = 4^n for n >= 0. - _Seiichi Manyama_, Jan 29 2017

%Y Cf. A018802 (k=2), A018857 (k=3), this sequence (k=4), A018861 (k=5), A018863 (k=6), A018865 (k=7), A018867 (k=8), A018869 (k=9).

%K nonn,base

%O 1,2

%A _David W. Wilson_