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 A214530 List of words over {1,7} with equal numbers of 1's and 7's. 2
 17, 71, 1177, 1717, 1771, 7117, 7171, 7711, 111777, 117177, 117717, 117771, 171177, 171717, 171771, 177117, 177171, 177711, 711177, 711717, 711771, 717117, 717171, 717711, 771117, 771171, 771711, 777111 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is to 7 as A214524 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 A087514. LINKS Table of n, a(n) for n=1..28. MATHEMATICA Sort[FromDigits/@Flatten[Table[Permutations[PadRight[{}, 2n, {1, 7}]], {n, 3}], 1]] (* Harvey P. Dale, Aug 30 2016 *) CROSSREFS Cf. A214218, A214488, A214521, A214522, A214524. Sequence in context: A069496 A047978 A050524 * A087514 A119625 A130748 Adjacent sequences: A214527 A214528 A214529 * A214531 A214532 A214533 KEYWORD nonn,base,easy AUTHOR Jonathan Vos Post, Jul 20 2012 STATUS approved

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Last modified June 19 16:35 EDT 2024. Contains 373503 sequences. (Running on oeis4.)