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Positions of even terms in A060131; indices of permutations of an even order in tables A060117 & A060118.
4

%I #7 Aug 11 2016 23:48:14

%S 1,2,4,6,7,9,11,12,15,16,17,18,20,21,23,24,25,26,27,28,29,31,32,34,37,

%T 38,40,43,44,46,48,49,51,53,55,56,58,60,61,62,64,66,67,68,70,72,75,76,

%U 77,78,79,80,82,85,86,88,90,91,92,94,96,98,99,101,102,103,104,106,108,109,110,112,115,116,118,120,121,122,123,124,125

%N Positions of even terms in A060131; indices of permutations of an even order in tables A060117 & A060118.

%H Antti Karttunen, <a href="/A275814/b275814.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Fa#facbase">Index entries for sequences related to factorial base representation</a>

%o (Scheme, with _Antti Karttunen_'s IntSeq-library)

%o (define A275814 (MATCHING-POS 1 1 (lambda (n) (even? (A060131 n)))))

%Y Complement: A275813.

%Y Cf. A060117, A060118, A060131.

%Y Cf. A275834 (a subsequence).

%K nonn

%O 1,2

%A _Antti Karttunen_, Aug 10 2016