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 A218127 Number of 10-ary sequences with primitive period n. 2
 1, 10, 90, 990, 9900, 99990, 998910, 9999990, 99990000, 999999000, 9999899910, 99999999990, 999998990100, 9999999999990, 99999989999910, 999999999899010, 9999999900000000, 99999999999999990, 999999998999001000, 9999999999999999990, 99999999989999990100 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..1000 (terms 0..300 from Alois P. Heinz) FORMULA a(n) = Sum_{d|n} 10^d * mu(n/d) for n>0, a(0) = 1. MAPLE with(numtheory): a:= n-> `if`(n=0, 1, add(10^d*mobius(n/d), d=divisors(n))): seq(a(n), n=0..30); CROSSREFS Column k=10 of A143324. Sequence in context: A097394 A172199 A063945 * A243106 A046706 A116348 Adjacent sequences:  A218124 A218125 A218126 * A218128 A218129 A218130 KEYWORD nonn AUTHOR Alois P. Heinz, Oct 21 2012 STATUS approved

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Last modified November 14 19:07 EST 2018. Contains 317214 sequences. (Running on oeis4.)