A214524 List of words over {1,6} with equal numbers of 1's and 6's.

16, 61, 1166, 1616, 1661, 6116, 6161, 6611, 111666, 116166, 116616, 116661, 161166, 161616, 161661, 166116, 166161, 166611, 611166, 611616, 611661, 616116, 616161, 616611, 661116, 661161, 661611, 666111

Offset

1,1

Comments

This is to 6 as A214522 is to 5, as A214521 is to 4, as A214488 is to 3, and as A214218 is to 2. The subsequence of primes (when interpreted as decimal integers) is A087513.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Sort[FromDigits/@Flatten[Table[Permutations[PadRight[{}, 2n, {1, 6}]], {n, 3}], 1]] (* Harvey P. Dale, May 11 2015 *)

Crossrefs

Cf. A214218, A214488, A214521, A214522.

Sequence in context: A264632 A373667 A007831 * A118254 A356249 A066391

Adjacent sequences: A214521 A214522 A214523 * A214525 A214526 A214527

Keyword

nonn,base,easy

Author

Jonathan Vos Post, Jul 19 2012

Status

approved