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
Links
- Robert Israel, Table of n, a(n) for n = 1..99
Programs
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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
Formula
a(n) = 13^A180694(n). - Michel Marcus, Jan 18 2016