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Fixed points of the permutation A093506.
3

%I #9 Jul 13 2013 12:03:49

%S 1,2,5,10,11,20,25,54,57,76,83,106,117,172,173,208,213,252,261,294,

%T 307,344,361,402,423,468,493,542,545,598,605,662,673,734,751,816,837,

%U 906,931,1004,1033,1190,1193,1278,1285,1374,1385,1478,1493,1590,1603,1704

%N Fixed points of the permutation A093506.

%C A093506(a(n)) = A187790(a(n)) = a(n).

%H Reinhard Zumkeller, <a href="/A187792/b187792.txt">Table of n, a(n) for n = 1..1000</a>

%o (Haskell)

%o a187792 n = a187792_list !! (n-1)

%o a187792_list = filter (\x -> a093506 x == x) [1..]

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Jan 06 2013