A180693 Smallest power of 13 that begins with n.

1, 2197, 371293, 4826809, 51185893014090757, 62748517, 7056410014866816666030739693, 815730721, 91733330193268616658399616009, 10604499373, 112455406951957393129, 12646218552730347184269489080961456410641, 13, 1461920290375446110677, 15502932802662396215269535105521

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..99

Formula

a(n) = 13^A180694(n). - Michel Marcus, Jan 18 2016

Maple

count:= 1:
A[1]:= 1:
for n from 1 while count < 99 do
x:= 13^n;
m:= ilog10(x);
for d from 0 to 1 do
   y:= floor(x/10^(m-d));
   if not assigned(A[y]) then
     count:= count+1;
     A[y]:= x;
   fi
od
od:
seq(A[i], i=1..99); # Robert Israel, Jan 17 2016

Crossrefs

Cf. A180691, A180694, A180695.

Sequence in context: A292714 A202459 A017535 * A013799 A013868 A044884

Adjacent sequences: A180690 A180691 A180692 * A180694 A180695 A180696

Keyword

base,nonn

Author

Daniel Mondot, Sep 18 2010

Status

approved