The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A180693

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Showing entries 1-10 | older changes

A180693

Smallest power of 13 that begins with n.
(history; published version)

#16 by Bruno Berselli at Mon Jan 18 03:18:40 EST 2016

STATUS

proposed

approved

#15 by Michel Marcus at Mon Jan 18 02:42:18 EST 2016

STATUS

editing

proposed

#14 by Michel Marcus at Mon Jan 18 02:41:54 EST 2016

FORMULA

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

STATUS

reviewed

editing

#13 by Joerg Arndt at Mon Jan 18 02:00:43 EST 2016

STATUS

proposed

reviewed

#12 by Robert Israel at Sun Jan 17 20:38:42 EST 2016

STATUS

editing

proposed

#11 by Robert Israel at Sun Jan 17 20:38:35 EST 2016

KEYWORD

base,more,nonn,changed

STATUS

proposed

editing

#10 by Robert Israel at Sun Jan 17 20:38:15 EST 2016

STATUS

editing

proposed

#9 by Robert Israel at Sun Jan 17 20:38:08 EST 2016

DATA

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

LINKS

Robert Israel, <a href="/A180693/b180693.txt">Table of n, a(n) for n = 1..99</a>

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

STATUS

approved

editing

#8 by N. J. A. Sloane at Sun Jan 17 20:11:35 EST 2016

STATUS

proposed

approved

#7 by Altug Alkan at Sun Jan 17 19:15:54 EST 2016

STATUS

editing

proposed