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A097252 Numbers whose set of base 6 digits is {0,5}. 5
0, 5, 30, 35, 180, 185, 210, 215, 1080, 1085, 1110, 1115, 1260, 1265, 1290, 1295, 6480, 6485, 6510, 6515, 6660, 6665, 6690, 6695, 7560, 7565, 7590, 7595, 7740, 7745, 7770, 7775, 38880, 38885, 38910, 38915, 39060, 39065, 39090, 39095, 39960, 39965 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

n such that there exists a permutation p_1, ..., p_n of 1, ..., n such that i + p_i is a power of 6 for every i.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..500

FORMULA

a(n) = 5*A033043(n).

a(2n) = 6*a(n), a(2n+1) = a(2n)+5.

MATHEMATICA

fQ[n_]:=Union@Join[{0, 5}, IntegerDigits[n, 6]]=={0, 5}; Select[Range[0, 40000], fQ] (* Vincenzo Librandi, May 25 2012 *)

PROG

(MAGMA) [n: n in [0..40000] | Set(IntegerToSequence(n, 6)) subset {0, 5}]; // Vincenzo Librandi, May 25 2012

CROSSREFS

Cf. A001196, A005823, A007088, A097251-A097262.

Sequence in context: A154522 A253805 A222463 * A169610 A206329 A043886

Adjacent sequences:  A097249 A097250 A097251 * A097253 A097254 A097255

KEYWORD

nonn,base

AUTHOR

Ray Chandler, Aug 03 2004

STATUS

approved

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Last modified April 27 15:06 EDT 2017. Contains 285528 sequences.