OFFSET
1,1
COMMENTS
LINKS
Robert Israel, Table of n, a(n) for n = 1..136
EXAMPLE
a(4) = 49 = 110001_2 = 1211_3.
MAPLE
R:= NULL: count:= 0:
for a from 2 while count < 136 do
for b from 1 to a-1 do
p:= 2^a + 2^b + 1;
if numboccur(1, convert(p, base, 3)) = 3 then
count:= count+1;
R:= R, p;
fi
od od:
R;
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Robert Israel, Jan 12 2017
STATUS
approved