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A061657 Numbers k > 1 such that, in base 3, k and k^2 contain the same digits in the same proportion. 12
184, 196, 464, 500, 544, 550, 552, 584, 588, 622, 626, 670, 706, 1392, 1436, 1472, 1500, 1552, 1632, 1650, 1654, 1656, 1744, 1752, 1764, 1866, 1868, 1878, 1978, 2010, 2030, 2116, 2118, 3922, 4136, 4176, 4308, 4388, 4416, 4500, 4656, 4732, 4756, 4896, 4900 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
184 = 20211_3 and 184^2 = 1201102221_3.
MAPLE
p:= n-> add(x^i, i=convert(n, base, 3)):
a:= proc(n) option remember; local k;
for k from 1+`if`(n=1, 0, a(n-1))
while p(k)*2<>p(k^2) do od; k
end:
seq(a(n), n=1..50); # Alois P. Heinz, May 10 2015
CROSSREFS
Sequence in context: A272126 A171563 A347504 * A217301 A351278 A239457
KEYWORD
base,easy,nonn
AUTHOR
Erich Friedman, Jun 16 2001
EXTENSIONS
Offset changed to 1 by Alois P. Heinz, May 10 2015
STATUS
approved

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Last modified March 3 04:01 EST 2024. Contains 370499 sequences. (Running on oeis4.)