This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A188341 Numbers having no 0's and not more than one 1 in their representation in base 3. 8
 1, 2, 5, 7, 8, 17, 23, 25, 26, 53, 71, 77, 79, 80, 161, 215, 233, 239, 241, 242, 485, 647, 701, 719, 725, 727, 728, 1457, 1943, 2105, 2159, 2177, 2183, 2185, 2186, 4373, 5831, 6317, 6479, 6533, 6551, 6557, 6559, 6560, 13121, 17495, 18953 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..1000 V. Shevelev, Binomial Coefficient Predictors, Journal of Integer Sequences, Vol. 14 (2011), Article 11.2.8 MAPLE a:= proc(n) option remember; local i, l, m, t;       m:= `if`(n=1, 0, a(n-1));       l:= NULL;       for t while m>0 do l:= l, irem(m, 3, 'm') od;       l:= array([l, 0]);       for i while l[i]=2 do od;       if l[i]=0 then l[i]:= 1                 else l[i]:= 2;                      if i>1 then l[i-1]:= 1 fi       fi;       add(l[i] *3^(i-1), i=1..t)     end: seq(a(n), n=1..100);  # Alois P. Heinz, Apr 02 2011 MATHEMATICA okQ[n_]:=DigitCount[n, 3, 0]==0&&DigitCount[n, 3, 1]<2; Select[Range[20000], okQ]  (* Harvey P. Dale, Apr 16 2011 *) CROSSREFS Cf. A062756, A077267. Sequence in context: A005624 A275410 A139481 * A238364 A227445 A216968 Adjacent sequences:  A188338 A188339 A188340 * A188342 A188343 A188344 KEYWORD nonn,base AUTHOR Vladimir Shevelev, Apr 02 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 7 03:00 EST 2019. Contains 329836 sequences. (Running on oeis4.)